I have a 93 truck, 22re, 5 speed. Recently (2 or 3 days ago) my voltmeter started moving ALOT. It would be around the 12ish area, but now it moves from 12ish to 9 or so then up to 13 or 14. it moves back and forth all the time while driving. Anyone have any ideas? Thanks. :wtf:

 

Alternator going out maybe? Or the belt is slipping so the Alt isnt spinning. Id say thats a good thing to check.

 

It should hang out right at 13-14 all the time. Being that it varies below this, I would also check for loose and/or corroded wiring. Usually if a voltage regualtor goes bad, voltage runs high, like 17-18 or so. A low voltage could also be indicative of a bad alternator or a bad battery. Start cheap and check out wiring first and then go from there.

 

I still think it could be voltage regulator. When mine died, voltage dropped to around 9 volts. The cause was worn slip ring brushes. Weak contact inside the alternator = low voltage. A bad winding in the alternator will cause low volts also, but since yours jumps around so much, I'd check the wiring first then the alternator for poor contact.

 

thanks for all of the help.