Posted by Sprint 6 on January 06, 2012 at 04:23:40 from (50.102.24.245):
In Reply to: DR44G GMC alternator posted by George Marsh on January 05, 2012 at 16:02:16:
Your alternator and volt meter are working fine. That system has a sensor around the ground cable near the battery. It uses that current sensor to sense electrical load and state of charge. GM did that to help save batteries, continually charging a battery at 14.5 volts will boil the battery. The system is designed to keep the battery at near 12 volts unless there is a high electrical demand. If you replace the alternator, the new one will do the same thing. I would charge the battery with a charger, start the truck once to pull off the surface charge, then do a normal load test.
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