Voltmeter bouncing - Ford Powerstroke Diesel Forum
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  #1  
Old 07-22-2014, 09:59 AM
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Voltmeter bouncing

Ok I have replaced batteries. Alternator. Tensioner pulley and one of the idler pulleys. None of those for this reason. They were all just wore out. Ok now my voltmeter will bounce very slightly. In the "normal" range it will bounce like between the m and a. Never does it move off those two letters. Just bounces back and forth. This also causes the battery light to come on. The battery light will come on for like half a second. It will just flash on and off. Need some help.
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Old 07-22-2014, 10:07 AM
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Check the wiring to the alt both power and signal side. may be loose or bad
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Old 07-22-2014, 10:13 AM
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Check a 10 or 5 amp fuse under the hood. I just can't remember the spot or the amp that it is.
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Old 07-22-2014, 10:30 AM
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Quote:
Originally Posted by Phillipjon View Post
Check a 10 or 5 amp fuse under the hood. I just can't remember the spot or the amp that it is.

if the fuse was blown it wouldnt work at all?
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Old 07-22-2014, 10:33 AM
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One would think, but it happened to me.
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Old 07-22-2014, 12:11 PM
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Ok ill check those tonight
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Old 07-22-2014, 12:35 PM
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Did you replace the tensioner itself, or just the pulley?

Check the connection of the quick-disconnect at the top of the alternator.
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Old 07-22-2014, 12:54 PM
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Have you put a volt meter on it? what does it show? How much is your alt putting out and how much is your batteries reading when running and off? If no drain I wouldn't sweat it.
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Old 07-25-2014, 11:25 AM
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Something quick and cheap is clean off all the grounding points in the engine bay. It might fix the problem and it might not but with your truck being that old cleaning the grounds isn't going to hurt. It's where I like to start with any electrical issues.
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Old 08-03-2014, 08:44 PM
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replaced the other idler pulley and put a new belt on it. problem has went away...
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