All my lights (In & Outside) dim-bright-dim-bright with idle??? - Ford Powerstroke Diesel Forum
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Old 01-17-2011, 04:23 AM
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All my lights (In & Outside) dim-bright-dim-bright with idle???

What would make all my lighting (headlights inside roof lights, gauge cluster, etc) dim with engine rotation? I am driving and my lights slightly get dim then bright, dim then bright. But this is very very quickly Like it gets a power surge or loss of power every revolution of the crank or alternator. I pulled over (On my way to Springfield,MO Then Great Falls, MT. Then Burbank, IL. Then waynesville, OH and last pick up Goshen, IN.) and tightened the terminals, alt post, and did a quick visual on wires but have no idea where to go from here.
Hopefully someone can guide me or have had this issue.

I will pull over today at 10am ct and check the post, But feel free to call me if y'all have the answer.
Bryan 210-452-4390
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Old 01-17-2011, 05:01 AM
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had the same problem
i had to change the alternator
it was charging but it had a spike in voltage
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Old 01-17-2011, 05:16 AM
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Old 01-17-2011, 06:12 AM
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Yup, that's exactly what happend to mine, changed the alt's and it's been good to go. Mine has dual alt', the 'extra' one, on the lower pass side of the motor is in a bad place, gets splashed by the tire. Been seein' a 'blip' in my headlights sometimes, I'm thinkin of replacing it again just to be on the safe side.
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