Volt meter?? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 05-11-2012, 06:29 AM Thread Starter
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Volt meter??

The volt meter swings back and forth like something is drawing. Ton of power for 2 seconds and then back to the middle what could this be??


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2008 f-350 CCLB,
Rough country 4.5" radius arm drop lift
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looney street from vivian
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post #2 of 4 Old 05-11-2012, 11:34 AM
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Weak batteries, perhaps. Glow plug relay closes, voltage drops, not enough voltage for the relay to hold, it opens again, battery voltage recovers, enough to close the relay again, voltage drops again, rinse, repeat. Is this with the key in RUN, engine off, or after it's started? Any trouble starting?
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post #3 of 4 Old 05-11-2012, 11:55 AM Thread Starter
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This is after running and no problems starting it does smoke until warmed up according to my dad it's his truck just trying to help him it also has over 300k

2008 f-350 CCLB,
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looney street from vivian
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post #4 of 4 Old 05-11-2012, 12:01 PM
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id bet the voltagae regulator in the alternator is shot. mine did the same thing. replaced alternator, all was well

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