Headlights dimming - Ford Powerstroke Diesel Forum
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Old 08-16-2011, 06:57 PM
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Headlights dimming

While ideling the headlights will dim down. Is it most likely an altenator getting weak?
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Old 08-16-2011, 11:06 PM
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There is a good chance it's the alternator. Hookup a real volt meter and post the voltages with the truck running and when it's off.
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