"yourpete" <none@000.com> wrote in message
news:951271_8f4af7ca4a55d1930a8829b577d7fdf6@autob oardz.com...
> 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.
>
It would help to know what year and model.

Mike