Voltage Regulator
Postmaster
Joined: Jul 2015
Posts: 4,392
Likes: 22
From: very South Texas
autozone calls out an Internal voltage regulator..
poor ground... at battery to engine or engine to frame
problems with a cell in the battery
even oil on the drive belt.. loose pulley on alternator ...
bad diode rack inside alternator ( 1 or 2 diodes are open..)... remove alternator and have it load tested at any good auto parts store..
even one of the 3 fields have issues..
poor ground... at battery to engine or engine to frame
problems with a cell in the battery
even oil on the drive belt.. loose pulley on alternator ...
bad diode rack inside alternator ( 1 or 2 diodes are open..)... remove alternator and have it load tested at any good auto parts store..
even one of the 3 fields have issues..
Thread Starter
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Junior User
Joined: Sep 2004
Posts: 52
Likes: 0
I noticed last night when checking voltage at the battery and at the stud on the alternator, that the voltage was doing the exact same thing at both locations.
When the truck is running, voltage is going from 14.7 to 14.8. to 14.9 to 15.0 to 15.1. to 15.2 to 15.3 really quickly and then starts over again.
Any thoughts?
When the truck is running, voltage is going from 14.7 to 14.8. to 14.9 to 15.0 to 15.1. to 15.2 to 15.3 really quickly and then starts over again.
Any thoughts?
Thread Starter
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Junior User
Joined: Sep 2004
Posts: 52
Likes: 0
I did read your post. to speak to that...
I was able to find a listing of the ground locations so I spent Sunday afternoon before I posted on here, undoing every ground, cleaning, dielectric greasing, and replacing one ground strap from body to frame that looked iffy. Even added another ground strap ( since I had an extra) from the engine to the frame. I feel safe to say it is not a ground issue.
I pulled the alternator off after testing the lights again, and taking it to a shop here in town that builds alternators and starters. (Not going to the big box stores)
Battery is new, belt is new, and tensioner is working great.
Are you thinking alternator issue Chuck? I was reading a forum somewhere that possibly the headlight switch....
I was able to find a listing of the ground locations so I spent Sunday afternoon before I posted on here, undoing every ground, cleaning, dielectric greasing, and replacing one ground strap from body to frame that looked iffy. Even added another ground strap ( since I had an extra) from the engine to the frame. I feel safe to say it is not a ground issue.
I pulled the alternator off after testing the lights again, and taking it to a shop here in town that builds alternators and starters. (Not going to the big box stores)
Battery is new, belt is new, and tensioner is working great.
Are you thinking alternator issue Chuck? I was reading a forum somewhere that possibly the headlight switch....
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Junior User
Joined: Sep 2004
Posts: 52
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Alternator Tested perfect. Guy at the Alternator place believes I have a bad "A terminal" wire going to the voltage regulator.
He gave me advice how to test and repair. I'll post back after complete
He gave me advice how to test and repair. I'll post back after complete
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Postmaster
Joined: Jul 2015
Posts: 4,392
Likes: 22
From: very South Texas
that would be the next step.. I would make..
Thanks for the update an tests done..
fyi.. just because the Battery is New... does not make it a good battery.... 100 amp load test....
5 percent of new batteries go bad the first month... 85 percent that make 12 months.. make 5 years....
many years under hoods....
Thanks for the update an tests done..
fyi.. just because the Battery is New... does not make it a good battery.... 100 amp load test....
5 percent of new batteries go bad the first month... 85 percent that make 12 months.. make 5 years....
many years under hoods....
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luckytruck79
1973 - 1979 F-100 & Larger F-Series Trucks
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Dec 4, 2005 10:41 PM