Why you should remove the negative battery terminal before doing ANYTHING!!!!
#31
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doingANYTHING!!!!
> tony, this is usenet - "credentials" don't mean . just stick to the
> facts.
>
> fact 1 - batteries don't "surge". period. some [reactive] peripherals
> can do it, unless protected. in cars, they all are. dome lights are
> not reactive.
No but a direct short could cause a problem in the item shorted. In the
case of some vehicles that could be the BCM if they use it for things
like an interior light timer/dimmer (close door and dome light stays on
for a bit) Shorting that circuit cause problems.
>
> fact 2 - ohmic behavior dictates that battery voltage drops as current
> increases, not the other way around.
Yes BUT take a chunk of wire and toss it across the battery. Measure the
battery voltage. It likely won't cause a voltage drop as it heats up and
melts.
>
> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
> reaction that could possibly cause a problem, even if the ecu was
> unprotected.
VERY WRONG. ECUs are easy to kill if you are not paying attention. My
SOP in the body shop is to pull the ECU on anything that rolls in for
panel work. One good zap from a welder can kill the ECU without being
near it.
>
> conclusion: either address reality or move on.
--
Steve W.
Near Cooperstown, New York
NRA Member
Pacifism - The theory that if they'd fed
Jeffrey Dahmer enough human flesh,
he'd have become a vegan.
#32
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
"Steve W." <csr684NOT@yahoo.com> wrote in news:fh80s0$kq$1@aioe.org:
jim beam <spamvortex@bad.example.net> wrote;
>> fact 2 - ohmic behavior dictates that battery voltage drops as
>> current increases, not the other way around.
>
> Yes BUT take a chunk of wire and toss it across the battery. Measure
> the battery voltage. It likely won't cause a voltage drop as it heats
> up and melts.
Yes,it will.That battery has internal resistance,and a short will draw a
lot of current and make for a heavy V drop.(the same happens every time you
start your car;there are specs for battery Vdrop while cranking.)
--
Jim Yanik
jyanik
at
kua.net
jim beam <spamvortex@bad.example.net> wrote;
>> fact 2 - ohmic behavior dictates that battery voltage drops as
>> current increases, not the other way around.
>
> Yes BUT take a chunk of wire and toss it across the battery. Measure
> the battery voltage. It likely won't cause a voltage drop as it heats
> up and melts.
Yes,it will.That battery has internal resistance,and a short will draw a
lot of current and make for a heavy V drop.(the same happens every time you
start your car;there are specs for battery Vdrop while cranking.)
--
Jim Yanik
jyanik
at
kua.net
#34
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
On about 92 and up:
The dome light is connected to the Body Control Module.
RK
"jim beam" <spamvortex@bad.example.net> wrote in message
news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
> Tony Hwang wrote:
>> Gary L. Burnore wrote:
>>
>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>
>>>
>>>> jim beam wrote:
>>>>
>>>>
>>>>> Hachiroku wrote:
>>>>> <snip crap>
>>>>>
>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>> someone
>>>>>> shorted out the ECU replacing the dome light...
>>>>>
>>>>>
>>>>> no way - the ecu's not even connected to the dome light. and they're
>>>>> electrically protected against all kinds of "user error", including
>>>>> battery reversal, over-voltage, dead shorts and static. short of
>>>>> direct lightning strike, water damage, or fire, none of which have a
>>>>> single damned thing to do with dome lights, the ecu's not going
>>>>> anywhere and it's /certainly/ not going to be fubared by a bulb
>>>>> change.
>>>>
>>>> Hi,
>>>> No way? If short caused a surge in the electrical system,
>>>
>>>
>>> You're kidding right?
>> Hi,
>> Probably you don't even know basic Ohm's law or Kirchoff's or
>> Tevnin Norton's theorem, etc. If you want to debate, email me directly.
>> Let's compare our CV first.
>
> tony, this is usenet - "credentials" don't mean . just stick to the
> facts.
>
> fact 1 - batteries don't "surge". period. some [reactive] peripherals
> can do it, unless protected. in cars, they all are. dome lights are not
> reactive.
>
> fact 2 - ohmic behavior dictates that battery voltage drops as current
> increases, not the other way around.
>
> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no reaction
> that could possibly cause a problem, even if the ecu was unprotected.
>
> conclusion: either address reality or move on.
The dome light is connected to the Body Control Module.
RK
"jim beam" <spamvortex@bad.example.net> wrote in message
news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
> Tony Hwang wrote:
>> Gary L. Burnore wrote:
>>
>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>
>>>
>>>> jim beam wrote:
>>>>
>>>>
>>>>> Hachiroku wrote:
>>>>> <snip crap>
>>>>>
>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>> someone
>>>>>> shorted out the ECU replacing the dome light...
>>>>>
>>>>>
>>>>> no way - the ecu's not even connected to the dome light. and they're
>>>>> electrically protected against all kinds of "user error", including
>>>>> battery reversal, over-voltage, dead shorts and static. short of
>>>>> direct lightning strike, water damage, or fire, none of which have a
>>>>> single damned thing to do with dome lights, the ecu's not going
>>>>> anywhere and it's /certainly/ not going to be fubared by a bulb
>>>>> change.
>>>>
>>>> Hi,
>>>> No way? If short caused a surge in the electrical system,
>>>
>>>
>>> You're kidding right?
>> Hi,
>> Probably you don't even know basic Ohm's law or Kirchoff's or
>> Tevnin Norton's theorem, etc. If you want to debate, email me directly.
>> Let's compare our CV first.
>
> tony, this is usenet - "credentials" don't mean . just stick to the
> facts.
>
> fact 1 - batteries don't "surge". period. some [reactive] peripherals
> can do it, unless protected. in cars, they all are. dome lights are not
> reactive.
>
> fact 2 - ohmic behavior dictates that battery voltage drops as current
> increases, not the other way around.
>
> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no reaction
> that could possibly cause a problem, even if the ecu was unprotected.
>
> conclusion: either address reality or move on.
#35
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
On Mon, 12 Nov 2007 01:54:05 +0000, Refinish King wrote:
> On about 92 and up:
>
> The dome light is connected to the Body Control Module.
>
> RK
Hey, RK, how ya doin'?
I wanted to ask you something a while ago, but I forget.
At any rate, right. The DL is connected to the BCM, which MAY have a
connection to the ECM.
> "jim beam" <spamvortex@bad.example.net> wrote in message
> news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
>> Tony Hwang wrote:
>>> Gary L. Burnore wrote:
>>>
>>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>>
>>>>
>>>>> jim beam wrote:
>>>>>
>>>>>
>>>>>> Hachiroku wrote:
>>>>>> <snip crap>
>>>>>>
>>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>>> someone
>>>>>>> shorted out the ECU replacing the dome light...
>>>>>>
>>>>>>
>>>>>> no way - the ecu's not even connected to the dome light. and
>>>>>> they're electrically protected against all kinds of "user error",
>>>>>> including battery reversal, over-voltage, dead shorts and static.
>>>>>> short of direct lightning strike, water damage, or fire, none of
>>>>>> which have a single damned thing to do with dome lights, the ecu's
>>>>>> not going anywhere and it's /certainly/ not going to be fubared by a
>>>>>> bulb change.
>>>>>
>>>>> Hi,
>>>>> No way? If short caused a surge in the electrical system,
>>>>
>>>>
>>>> You're kidding right?
>>> Hi,
>>> Probably you don't even know basic Ohm's law or Kirchoff's or Tevnin
>>> Norton's theorem, etc. If you want to debate, email me directly. Let's
>>> compare our CV first.
>>
>> tony, this is usenet - "credentials" don't mean . just stick to the
>> facts.
>>
>> fact 1 - batteries don't "surge". period. some [reactive] peripherals
>> can do it, unless protected. in cars, they all are. dome lights are
>> not reactive.
>>
>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>> increases, not the other way around.
>>
>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
>> reaction that could possibly cause a problem, even if the ecu was
>> unprotected.
>>
>> conclusion: either address reality or move on.
> On about 92 and up:
>
> The dome light is connected to the Body Control Module.
>
> RK
Hey, RK, how ya doin'?
I wanted to ask you something a while ago, but I forget.
At any rate, right. The DL is connected to the BCM, which MAY have a
connection to the ECM.
> "jim beam" <spamvortex@bad.example.net> wrote in message
> news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
>> Tony Hwang wrote:
>>> Gary L. Burnore wrote:
>>>
>>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>>
>>>>
>>>>> jim beam wrote:
>>>>>
>>>>>
>>>>>> Hachiroku wrote:
>>>>>> <snip crap>
>>>>>>
>>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>>> someone
>>>>>>> shorted out the ECU replacing the dome light...
>>>>>>
>>>>>>
>>>>>> no way - the ecu's not even connected to the dome light. and
>>>>>> they're electrically protected against all kinds of "user error",
>>>>>> including battery reversal, over-voltage, dead shorts and static.
>>>>>> short of direct lightning strike, water damage, or fire, none of
>>>>>> which have a single damned thing to do with dome lights, the ecu's
>>>>>> not going anywhere and it's /certainly/ not going to be fubared by a
>>>>>> bulb change.
>>>>>
>>>>> Hi,
>>>>> No way? If short caused a surge in the electrical system,
>>>>
>>>>
>>>> You're kidding right?
>>> Hi,
>>> Probably you don't even know basic Ohm's law or Kirchoff's or Tevnin
>>> Norton's theorem, etc. If you want to debate, email me directly. Let's
>>> compare our CV first.
>>
>> tony, this is usenet - "credentials" don't mean . just stick to the
>> facts.
>>
>> fact 1 - batteries don't "surge". period. some [reactive] peripherals
>> can do it, unless protected. in cars, they all are. dome lights are
>> not reactive.
>>
>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>> increases, not the other way around.
>>
>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
>> reaction that could possibly cause a problem, even if the ecu was
>> unprotected.
>>
>> conclusion: either address reality or move on.
#36
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doingANYTHING!!!!
Jim Yanik wrote:
> "Steve W." <csr684NOT@yahoo.com> wrote in news:fh80s0$kq$1@aioe.org:
>
> jim beam <spamvortex@bad.example.net> wrote;
>
>
>>>fact 2 - ohmic behavior dictates that battery voltage drops as
>>>current increases, not the other way around.
>>
>>Yes BUT take a chunk of wire and toss it across the battery. Measure
>>the battery voltage. It likely won't cause a voltage drop as it heats
>>up and melts.
>
>
> Yes,it will.That battery has internal resistance,and a short will draw a
> lot of current and make for a heavy V drop.(the same happens every time you
> start your car;there are specs for battery Vdrop while cranking.)
>
Hi,
Internal resistance is very small value. Against dead short it's not a
big factor. Cranking is not a dead short situation. Once I dropped a
pair of plier across heavy industrial battery terminals. The plier
litterally evaporated.
> "Steve W." <csr684NOT@yahoo.com> wrote in news:fh80s0$kq$1@aioe.org:
>
> jim beam <spamvortex@bad.example.net> wrote;
>
>
>>>fact 2 - ohmic behavior dictates that battery voltage drops as
>>>current increases, not the other way around.
>>
>>Yes BUT take a chunk of wire and toss it across the battery. Measure
>>the battery voltage. It likely won't cause a voltage drop as it heats
>>up and melts.
>
>
> Yes,it will.That battery has internal resistance,and a short will draw a
> lot of current and make for a heavy V drop.(the same happens every time you
> start your car;there are specs for battery Vdrop while cranking.)
>
Hi,
Internal resistance is very small value. Against dead short it's not a
big factor. Cranking is not a dead short situation. Once I dropped a
pair of plier across heavy industrial battery terminals. The plier
litterally evaporated.
#37
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doingANYTHING!!!!
Hachiroku ãƒãƒãƒã‚¯ wrote:
> On Mon, 12 Nov 2007 01:54:05 +0000, Refinish King wrote:
>
>
>>On about 92 and up:
>>
>>The dome light is connected to the Body Control Module.
>>
>>RK
>
>
> Hey, RK, how ya doin'?
>
> I wanted to ask you something a while ago, but I forget.
>
> At any rate, right. The DL is connected to the BCM, which MAY have a
> connection to the ECM.
>
>
Boy, am I glad that my newest vehicle is an '83...
JT
#38
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doingANYTHING!!!!
Steve W. wrote:
>
>> tony, this is usenet - "credentials" don't mean . just stick to
>> the facts.
>>
>> fact 1 - batteries don't "surge". period. some [reactive]
>> peripherals can do it, unless protected. in cars, they all are. dome
>> lights are not reactive.
>
> No but a direct short could cause a problem in the item shorted. In the
> case of some vehicles that could be the BCM if they use it for things
> like an interior light timer/dimmer (close door and dome light stays on
> for a bit) Shorting that circuit cause problems.
rubbish.
>
>>
>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>> increases, not the other way around.
>
> Yes BUT take a chunk of wire and toss it across the battery. Measure the
> battery voltage. It likely won't cause a voltage drop as it heats up and
> melts.
"likely"??? dude, it /definitely/ does! grade school science class.
>
>>
>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
>> reaction that could possibly cause a problem, even if the ecu was
>> unprotected.
>
> VERY WRONG. ECUs are easy to kill if you are not paying attention. My
> SOP in the body shop is to pull the ECU on anything that rolls in for
> panel work. One good zap from a welder can kill the ECU without being
> near it.
eh? welding is a whole different ball game to shorting a fuse protected
light circuit. welding is done at voltages and currents in excess of
those seen in vehicle operation, and is accompanies by all kinds of
radio frequency noise, both from the spark and the welder, depending on
welder type! yes, it's good to disconnect the ecu while welding. no,
shorting a light circuit doesn't replicate those conditions.
>
>>
>> conclusion: either address reality or move on.
>
>
>
>> tony, this is usenet - "credentials" don't mean . just stick to
>> the facts.
>>
>> fact 1 - batteries don't "surge". period. some [reactive]
>> peripherals can do it, unless protected. in cars, they all are. dome
>> lights are not reactive.
>
> No but a direct short could cause a problem in the item shorted. In the
> case of some vehicles that could be the BCM if they use it for things
> like an interior light timer/dimmer (close door and dome light stays on
> for a bit) Shorting that circuit cause problems.
rubbish.
>
>>
>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>> increases, not the other way around.
>
> Yes BUT take a chunk of wire and toss it across the battery. Measure the
> battery voltage. It likely won't cause a voltage drop as it heats up and
> melts.
"likely"??? dude, it /definitely/ does! grade school science class.
>
>>
>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
>> reaction that could possibly cause a problem, even if the ecu was
>> unprotected.
>
> VERY WRONG. ECUs are easy to kill if you are not paying attention. My
> SOP in the body shop is to pull the ECU on anything that rolls in for
> panel work. One good zap from a welder can kill the ECU without being
> near it.
eh? welding is a whole different ball game to shorting a fuse protected
light circuit. welding is done at voltages and currents in excess of
those seen in vehicle operation, and is accompanies by all kinds of
radio frequency noise, both from the spark and the welder, depending on
welder type! yes, it's good to disconnect the ecu while welding. no,
shorting a light circuit doesn't replicate those conditions.
>
>>
>> conclusion: either address reality or move on.
>
>
#39
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doingANYTHING!!!!
Tony Hwang wrote:
> Jim Yanik wrote:
>> "Steve W." <csr684NOT@yahoo.com> wrote in news:fh80s0$kq$1@aioe.org:
>>
>> jim beam <spamvortex@bad.example.net> wrote;
>>
>>
>>>> fact 2 - ohmic behavior dictates that battery voltage drops as
>>>> current increases, not the other way around.
>>>
>>> Yes BUT take a chunk of wire and toss it across the battery. Measure
>>> the battery voltage. It likely won't cause a voltage drop as it heats
>>> up and melts.
>>
>>
>> Yes,it will.That battery has internal resistance,and a short will draw
>> a lot of current and make for a heavy V drop.(the same happens every
>> time you start your car;there are specs for battery Vdrop while
>> cranking.)
> Hi,
> Internal resistance is very small value.
what is it then? state the number of ohms. typical honda civic battery.
> Against dead short it's not a
> big factor.
it is when it's the largest resistance in the circuit!
> Cranking is not a dead short situation.
and?
> Once I dropped a
> pair of plier across heavy industrial battery terminals. The plier
> litterally evaporated.
sure. and how much did the voltage drop?
> Jim Yanik wrote:
>> "Steve W." <csr684NOT@yahoo.com> wrote in news:fh80s0$kq$1@aioe.org:
>>
>> jim beam <spamvortex@bad.example.net> wrote;
>>
>>
>>>> fact 2 - ohmic behavior dictates that battery voltage drops as
>>>> current increases, not the other way around.
>>>
>>> Yes BUT take a chunk of wire and toss it across the battery. Measure
>>> the battery voltage. It likely won't cause a voltage drop as it heats
>>> up and melts.
>>
>>
>> Yes,it will.That battery has internal resistance,and a short will draw
>> a lot of current and make for a heavy V drop.(the same happens every
>> time you start your car;there are specs for battery Vdrop while
>> cranking.)
> Hi,
> Internal resistance is very small value.
what is it then? state the number of ohms. typical honda civic battery.
> Against dead short it's not a
> big factor.
it is when it's the largest resistance in the circuit!
> Cranking is not a dead short situation.
and?
> Once I dropped a
> pair of plier across heavy industrial battery terminals. The plier
> litterally evaporated.
sure. and how much did the voltage drop?
#40
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doingANYTHING!!!!
Refinish King wrote:
> On about 92 and up:
>
> The dome light is connected to the Body Control Module.
yes, which is not the ecu!
>
> RK
> "jim beam" <spamvortex@bad.example.net> wrote in message
> news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
>> Tony Hwang wrote:
>>> Gary L. Burnore wrote:
>>>
>>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>>
>>>>
>>>>> jim beam wrote:
>>>>>
>>>>>
>>>>>> Hachiroku wrote:
>>>>>> <snip crap>
>>>>>>
>>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>>> someone
>>>>>>> shorted out the ECU replacing the dome light...
>>>>>>
>>>>>> no way - the ecu's not even connected to the dome light. and they're
>>>>>> electrically protected against all kinds of "user error", including
>>>>>> battery reversal, over-voltage, dead shorts and static. short of
>>>>>> direct lightning strike, water damage, or fire, none of which have a
>>>>>> single damned thing to do with dome lights, the ecu's not going
>>>>>> anywhere and it's /certainly/ not going to be fubared by a bulb
>>>>>> change.
>>>>> Hi,
>>>>> No way? If short caused a surge in the electrical system,
>>>>
>>>> You're kidding right?
>>> Hi,
>>> Probably you don't even know basic Ohm's law or Kirchoff's or
>>> Tevnin Norton's theorem, etc. If you want to debate, email me directly.
>>> Let's compare our CV first.
>> tony, this is usenet - "credentials" don't mean . just stick to the
>> facts.
>>
>> fact 1 - batteries don't "surge". period. some [reactive] peripherals
>> can do it, unless protected. in cars, they all are. dome lights are not
>> reactive.
>>
>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>> increases, not the other way around.
>>
>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no reaction
>> that could possibly cause a problem, even if the ecu was unprotected.
>>
>> conclusion: either address reality or move on.
>
>
> On about 92 and up:
>
> The dome light is connected to the Body Control Module.
yes, which is not the ecu!
>
> RK
> "jim beam" <spamvortex@bad.example.net> wrote in message
> news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
>> Tony Hwang wrote:
>>> Gary L. Burnore wrote:
>>>
>>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>>
>>>>
>>>>> jim beam wrote:
>>>>>
>>>>>
>>>>>> Hachiroku wrote:
>>>>>> <snip crap>
>>>>>>
>>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>>> someone
>>>>>>> shorted out the ECU replacing the dome light...
>>>>>>
>>>>>> no way - the ecu's not even connected to the dome light. and they're
>>>>>> electrically protected against all kinds of "user error", including
>>>>>> battery reversal, over-voltage, dead shorts and static. short of
>>>>>> direct lightning strike, water damage, or fire, none of which have a
>>>>>> single damned thing to do with dome lights, the ecu's not going
>>>>>> anywhere and it's /certainly/ not going to be fubared by a bulb
>>>>>> change.
>>>>> Hi,
>>>>> No way? If short caused a surge in the electrical system,
>>>>
>>>> You're kidding right?
>>> Hi,
>>> Probably you don't even know basic Ohm's law or Kirchoff's or
>>> Tevnin Norton's theorem, etc. If you want to debate, email me directly.
>>> Let's compare our CV first.
>> tony, this is usenet - "credentials" don't mean . just stick to the
>> facts.
>>
>> fact 1 - batteries don't "surge". period. some [reactive] peripherals
>> can do it, unless protected. in cars, they all are. dome lights are not
>> reactive.
>>
>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>> increases, not the other way around.
>>
>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no reaction
>> that could possibly cause a problem, even if the ecu was unprotected.
>>
>> conclusion: either address reality or move on.
>
>
#41
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>No way? If short caused a surge in the electrical system, anything is
>possible.
Maybe he reversed the polarity of the Bogon Flux ?
>No way? If short caused a surge in the electrical system, anything is
>possible.
Maybe he reversed the polarity of the Bogon Flux ?
#42
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
On Sun, 11 Nov 2007 21:26:28 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>Tevnin Norton's theorem, etc. If you want to debate, email me directly.
Hey, I can even _spell_ Thevenin
>Tevnin Norton's theorem, etc. If you want to debate, email me directly.
Hey, I can even _spell_ Thevenin
#43
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
On Sat, 10 Nov 2007 18:04:00 -0800, jim beam wrote:
> Hachiroku wrote:
> <snip crap>
>> I had heard of this before; I can't remember what the car was, but
>> someone shorted out the ECU replacing the dome light...
>
> no way - the ecu's not even connected to the dome light. and they're
> electrically protected against all kinds of "user error", including
> battery reversal, over-voltage, dead shorts and static. short of direct
> lightning strike, water damage, or fire, none of which have a single
> damned thing to do with dome lights, the ecu's not going anywhere and it's
> /certainly/ not going to be fubared by a bulb change.
I talked to him last night. He says he wants you to come out and tell him
why his Pathfinder won't start after changing the dome light...
> Hachiroku wrote:
> <snip crap>
>> I had heard of this before; I can't remember what the car was, but
>> someone shorted out the ECU replacing the dome light...
>
> no way - the ecu's not even connected to the dome light. and they're
> electrically protected against all kinds of "user error", including
> battery reversal, over-voltage, dead shorts and static. short of direct
> lightning strike, water damage, or fire, none of which have a single
> damned thing to do with dome lights, the ecu's not going anywhere and it's
> /certainly/ not going to be fubared by a bulb change.
I talked to him last night. He says he wants you to come out and tell him
why his Pathfinder won't start after changing the dome light...
#44
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
On Tue, 13 Nov 2007 02:12:44 GMT, Hachiroku ???? <Trueno@AE86.gts>
wrote:
>On Sat, 10 Nov 2007 18:04:00 -0800, jim beam wrote:
>
>> Hachiroku wrote:
>> <snip crap>
>>> I had heard of this before; I can't remember what the car was, but
>>> someone shorted out the ECU replacing the dome light...
>>
>> no way - the ecu's not even connected to the dome light. and they're
>> electrically protected against all kinds of "user error", including
>> battery reversal, over-voltage, dead shorts and static. short of direct
>> lightning strike, water damage, or fire, none of which have a single
>> damned thing to do with dome lights, the ecu's not going anywhere and it's
>> /certainly/ not going to be fubared by a bulb change.
>
>I talked to him last night. He says he wants you to come out and tell him
>why his Pathfinder won't start after changing the dome light...
>
Anybody that says a short on a voltage line can't hurt an ECU has
never worked on computers.....
--
Scott in Florida
wrote:
>On Sat, 10 Nov 2007 18:04:00 -0800, jim beam wrote:
>
>> Hachiroku wrote:
>> <snip crap>
>>> I had heard of this before; I can't remember what the car was, but
>>> someone shorted out the ECU replacing the dome light...
>>
>> no way - the ecu's not even connected to the dome light. and they're
>> electrically protected against all kinds of "user error", including
>> battery reversal, over-voltage, dead shorts and static. short of direct
>> lightning strike, water damage, or fire, none of which have a single
>> damned thing to do with dome lights, the ecu's not going anywhere and it's
>> /certainly/ not going to be fubared by a bulb change.
>
>I talked to him last night. He says he wants you to come out and tell him
>why his Pathfinder won't start after changing the dome light...
>
Anybody that says a short on a voltage line can't hurt an ECU has
never worked on computers.....
--
Scott in Florida
#45
Guest
Posts: n/a
Re: Why you should remove the negative battery terminal before doing ANYTHING!!!!
I'm doing great!
Thank you.
If anything is connected to the BCM, it will be in someway connected to the
ECM. Through a Bus or a connector.
RK
"Hachiroku ????" <Trueno@AE86.gts> wrote in message
news:GGOZi.10705$h61.8533@trndny02...
> On Mon, 12 Nov 2007 01:54:05 +0000, Refinish King wrote:
>
>> On about 92 and up:
>>
>> The dome light is connected to the Body Control Module.
>>
>> RK
>
> Hey, RK, how ya doin'?
>
> I wanted to ask you something a while ago, but I forget.
>
> At any rate, right. The DL is connected to the BCM, which MAY have a
> connection to the ECM.
>
>
>> "jim beam" <spamvortex@bad.example.net> wrote in message
>> news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
>>> Tony Hwang wrote:
>>>> Gary L. Burnore wrote:
>>>>
>>>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>>>
>>>>>
>>>>>> jim beam wrote:
>>>>>>
>>>>>>
>>>>>>> Hachiroku wrote:
>>>>>>> <snip crap>
>>>>>>>
>>>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>>>> someone
>>>>>>>> shorted out the ECU replacing the dome light...
>>>>>>>
>>>>>>>
>>>>>>> no way - the ecu's not even connected to the dome light. and
>>>>>>> they're electrically protected against all kinds of "user error",
>>>>>>> including battery reversal, over-voltage, dead shorts and static.
>>>>>>> short of direct lightning strike, water damage, or fire, none of
>>>>>>> which have a single damned thing to do with dome lights, the ecu's
>>>>>>> not going anywhere and it's /certainly/ not going to be fubared by a
>>>>>>> bulb change.
>>>>>>
>>>>>> Hi,
>>>>>> No way? If short caused a surge in the electrical system,
>>>>>
>>>>>
>>>>> You're kidding right?
>>>> Hi,
>>>> Probably you don't even know basic Ohm's law or Kirchoff's or Tevnin
>>>> Norton's theorem, etc. If you want to debate, email me directly. Let's
>>>> compare our CV first.
>>>
>>> tony, this is usenet - "credentials" don't mean . just stick to the
>>> facts.
>>>
>>> fact 1 - batteries don't "surge". period. some [reactive] peripherals
>>> can do it, unless protected. in cars, they all are. dome lights are
>>> not reactive.
>>>
>>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>>> increases, not the other way around.
>>>
>>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
>>> reaction that could possibly cause a problem, even if the ecu was
>>> unprotected.
>>>
>>> conclusion: either address reality or move on.
>
Thank you.
If anything is connected to the BCM, it will be in someway connected to the
ECM. Through a Bus or a connector.
RK
"Hachiroku ????" <Trueno@AE86.gts> wrote in message
news:GGOZi.10705$h61.8533@trndny02...
> On Mon, 12 Nov 2007 01:54:05 +0000, Refinish King wrote:
>
>> On about 92 and up:
>>
>> The dome light is connected to the Body Control Module.
>>
>> RK
>
> Hey, RK, how ya doin'?
>
> I wanted to ask you something a while ago, but I forget.
>
> At any rate, right. The DL is connected to the BCM, which MAY have a
> connection to the ECM.
>
>
>> "jim beam" <spamvortex@bad.example.net> wrote in message
>> news:VYadnT-dlqDY66ranZ2dnUVZ_qKgnZ2d@speakeasy.net...
>>> Tony Hwang wrote:
>>>> Gary L. Burnore wrote:
>>>>
>>>>> On Sun, 11 Nov 2007 02:17:38 GMT, Tony Hwang <dragon40@shaw.ca> wrote:
>>>>>
>>>>>
>>>>>> jim beam wrote:
>>>>>>
>>>>>>
>>>>>>> Hachiroku wrote:
>>>>>>> <snip crap>
>>>>>>>
>>>>>>>> I had heard of this before; I can't remember what the car was, but
>>>>>>>> someone
>>>>>>>> shorted out the ECU replacing the dome light...
>>>>>>>
>>>>>>>
>>>>>>> no way - the ecu's not even connected to the dome light. and
>>>>>>> they're electrically protected against all kinds of "user error",
>>>>>>> including battery reversal, over-voltage, dead shorts and static.
>>>>>>> short of direct lightning strike, water damage, or fire, none of
>>>>>>> which have a single damned thing to do with dome lights, the ecu's
>>>>>>> not going anywhere and it's /certainly/ not going to be fubared by a
>>>>>>> bulb change.
>>>>>>
>>>>>> Hi,
>>>>>> No way? If short caused a surge in the electrical system,
>>>>>
>>>>>
>>>>> You're kidding right?
>>>> Hi,
>>>> Probably you don't even know basic Ohm's law or Kirchoff's or Tevnin
>>>> Norton's theorem, etc. If you want to debate, email me directly. Let's
>>>> compare our CV first.
>>>
>>> tony, this is usenet - "credentials" don't mean . just stick to the
>>> facts.
>>>
>>> fact 1 - batteries don't "surge". period. some [reactive] peripherals
>>> can do it, unless protected. in cars, they all are. dome lights are
>>> not reactive.
>>>
>>> fact 2 - ohmic behavior dictates that battery voltage drops as current
>>> increases, not the other way around.
>>>
>>> fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
>>> reaction that could possibly cause a problem, even if the ecu was
>>> unprotected.
>>>
>>> conclusion: either address reality or move on.
>