Voltage Fluctuating
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Senior User
Joined: Jan 2009
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Voltage Fluctuating
Problem just started with my 2000 V10 Excursion, voltage fluctuating and battery light flashing on and off approx 2 times a second. With head lights on slight fluctuation coinciding with batter light. Suspecting a voltage regulation problem, is this built into the alternator of is there an external unit? New battery installed month ago and is fully charged. Is there a way to confirm where this problem is? Many thanks for any suggestions.
TreadLightly
Joined: Oct 2006
Posts: 1,608
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From: SE Missouri
You could search and find your answer.... You could search the engine forum for your engine. Just from experience: try removing the negative terminal off your battery while the engine is running. If the engine dies or runs rougher then your alternator is bad. Searching is your friend and you can learn a ton while searching.
Lead Driver
Joined: Mar 2010
Posts: 5,250
Likes: 11
From: West Virginia
put a multimeter on so you can see if its voltage or amps. If the voltage is constant its not a voltage spike. If voltage is wildly oscillating then its your regulator. I don't have a v10 but I believe they have an internal regulator. Most newer vehicles do.
If the voltage is constant then I believe your problem could be a bad ground, so check your engine block and battery ground straps, and make sure the body is adequately grounded as well.
If the voltage is constant then I believe your problem could be a bad ground, so check your engine block and battery ground straps, and make sure the body is adequately grounded as well.
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