95SUBURBANLM7
OBS Enthusiast
- Joined
- Jun 8, 2015
- Messages
- 80
- Reaction score
- 8
Hey all, I've got a problem. Recently my volt gauge would drop to 11.5 and jump up to its usual 14.4+ area. It kept doing this until finally the needle spent more time on the left side of the gauge. I finally took my alternator in and the brushes were nearly gone so they were replaced and the alternator tested fine @ 14.5+v @ 120a load. The short of the story is that this kept happening. The alt tested good on the bench but as soon as it was installed, the voltage hovers around 12v. I even took it to AutoZone and they tested it twice and it passed all three times. So for whatever reason, once it's installed in my truck, it doesn't want to charge . I even bought a new battery, but the same thing happens. I've cleaned the mounting points of the alternator and the alternator bracket and I've checked all three major grounds and they are all checking out good. The PCM has been tuned out, so the brown wire is only connected to the indicator light. I even connected the jumper cables from the alternators log directly to the battery and from the case directly to the battery and I still have the low-voltage problem. What am I missing?
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