Voltage concern - Ford Powerstroke Diesel Forum

 
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post #1 of 8 Old 10-25-2012, 10:00 AM Thread Starter
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Voltage concern

What can cause your voltage to jump to about 16 and have the light pop on then drop back?

It did this off and on right now while driving. Pulled over to grab lunch and post this.

1999 (05/99) F250 7.3 Mods: DIY intake and muffler delete (impressive huh?)
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post #2 of 8 Old 10-25-2012, 10:04 AM Thread Starter
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Oh the batteries are a week old

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post #3 of 8 Old 10-25-2012, 10:09 AM
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bad alternator, be my guess. Checlk ur connections at batteries..

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #4 of 8 Old 10-25-2012, 10:27 AM
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Check if any of the lines are chaffing with each other and causing the jump?

"Light pop on then drop back"... which light?
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post #5 of 8 Old 10-25-2012, 01:30 PM Thread Starter
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Sorry about that the check battery light or the voltage the little battery light clicked on and then turned back off. Like a fluctuation. After lunch it never happened again.

I can't recall what could have set it off. I'm not romping it or anything, in fact I'm babying it because of the newly rebuilt tranny that just got put into it.

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post #6 of 8 Old 10-25-2012, 07:48 PM
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Sounds like voltage regulator in alternator. Check alternator output with voltmeter.
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post #7 of 8 Old 10-26-2012, 09:57 AM Thread Starter
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So far it hasn't spazzed out again...odd..

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post #8 of 8 Old 10-27-2012, 09:28 AM
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Don't hold your breath for too long. My 01 started with the alt light. Ended up killing my batteries alt output went for crap. Ended up buying a new one. Just my .02.


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Done: K&N CIA, Torklift Camper tie down system, Firestone Ride Rite Air Suspension(Dual guage control, w/ reservoir tank), Autometer 3 Pillar guage(Boost,EGT,Tranny Temp), Vision Type 81 19.5" w/ Goodyear G622 RSD 245/70r19.5 LRG, 03-07 power/heat/light mirror conversion, Sinister Coolant Filter kit.
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