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yourpete




Joined: Dec 14, 2006
Posts: 3

Location: U.K.
(Msg. 1) Posted: Thu Dec 14, 2006 8:02 pm
Post subject: 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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michaeltnull

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Since: Oct 30, 2004
Posts: 1802



(Msg. 2) Posted: Fri Dec 15, 2006 5:21 am
Post subject: Re: Voltage unstable [Login to view extended thread Info.]
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"yourpete" <none RemoveThis @000.com> wrote in message
news:951271_8f4af7ca4a55d1930a8829b577d7fdf6@autoboardz.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

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yourpete




Joined: Dec 14, 2006
Posts: 3

Location: U.K.
(Msg. 3) Posted: Fri Dec 15, 2006 10:11 am
Post subject: Re: Voltage unstable [Login to view extended thread Info.]
Accord 2.2 diesel 4 door saloon. June 2004.
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Stewart DIBBS

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Since: May 02, 2005
Posts: 313



(Msg. 4) Posted: Fri Dec 15, 2006 4:15 pm
Post subject: Re: Voltage unstable [Login to view extended thread Info.]
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"yourpete" <none DeleteThis @000.com> wrote in message
news:951271_8f4af7ca4a55d1930a8829b577d7fdf6@autoboardz.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.

OK, lets look at what causes a visible variation: change in voltage. Since
you say the alternator and battery have tested OK, then its likely a
mechanical rather than an electrical problem.

What causes an alternator to vary voltage? A slipping belt is the usual
reason. A bad ground is another.

> But when in say 4th or 5th gear at about 1500
> revs(Diesel model) and I lift off the accelerator the lights
> brighten up...

Have a good look at all the alternator mounting brackets. Is anything loose?
eg the main pivot bolt on to the block. Check all the engine block to
chassis ground links.

Is the crank pulley loose or is a two part balancer type? Could be the
pulley is separating and moving the belt around causing slipage or lateral
movement in the alternator.

SD
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yourpete




Joined: Dec 14, 2006
Posts: 3

Location: U.K.
(Msg. 5) Posted: Fri Dec 15, 2006 7:31 pm
Post subject: Re: Voltage unstable [Login to view extended thread Info.]
I have thought of this route BUT this problem ONLY happens after the engine has warmed up. This leads me towards an electrical problem and your thoughts about a poor earth will be checked. If a poor earth should this not have shown up when the battery and alternator were checked?
The unit that controls electrics has just been replaced with no change to the problem.
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