Voltage unstable
 

During night driving I have noticed that the head lights vary in
brightness. They brighten up at about 2500 to 3000 revs and dim when
the revs drop. But when in say 4th or 5th gear at about 1500
revs(Diesel model) and I lift off the accrelator the lights
brightenup?. Strange. This will voltage varation only happens AFTER
the engine has warmed up. The brightness varation is also noted if you
over-ride the interior lights. My garage has replaced the control unit
but no change. Any suggestions. The battery and alternator have been
FULLY checked out and found to be OK.

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