headlights 1st dim, then get bright ? ? - Ford Powerstroke Diesel Forum
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Old 01-21-2011, 04:56 AM
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headlights 1st dim, then get bright ? ?

My 01 headlights are dim when i have the truck warming up in the mornings, for 10-15 mintues. Then driving down the road 1/2 mile or so in a 20mph zone, they will gain the brightness they should have. Not a flicker on / off thing,,,, but it takes a while for them to light up to full brightness ...

Is there something you guys know for me to check for this issue? I have new batteries,,,, everything else electrical is fin.

Thanks guys, RB
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Old 01-21-2011, 05:08 AM
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I know the alternator doesn't turn on for a few minutes or something like that when you first start up.Not sure how long for or if thats what you are seeing.
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Old 01-21-2011, 05:27 AM
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That sorts seems like the issue, a lower voltage to the headlights, then once off idle/warmup and driving with a few rpms, the lights gain full brightness or voltage and light up fine. Kind of a delay thing.

Thanks, RB
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Old 01-21-2011, 10:16 AM
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I would suggest either your voltage reg isn't working correct. You got a bad ground that isn't making a pefrect connection till it warms up removing the moisture. I dont know if thats anything that can help. I have seen those happen.
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Old 01-21-2011, 10:51 AM
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It is normal not to see proper voltage output until the glow plugs turn off. This can take a few minutes. Depending on how cold it is out they stay on long after the wait to start light goes out.
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Old 01-21-2011, 11:19 AM
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This happens after I warm the truck for 10 minutes or so even when on the elec plug for a few hours, AND drive 4-500 yards down the road from my place. They brighten up quite a bit from the initial 'dim' illumination.

It's just friggin Agravating.... I finally stop all my oil leaks,,,,, then tranny goes out, so after new BTS tranny/new radiator/new cooler,,, the dayumm ICP goes out,,,CPS goes out,,,, an all along the headlight issue has had me a little flustered.

I wanna have my truck trouble free again.. any body know a halveazzed hungry Exorcist needing sum work ? ?


Thanks, Russ
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Old 01-21-2011, 06:33 PM
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Sounds like the voltage regulater to me also or you alt is starting to go out. My truck did this a little and I tried to get a alt rebuild kit but I couldnt find one for my alt so I took it apart and found out that the brushes were almost worn all the way out so I had to get a new one.
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