SOURCE: 2002 monte carlo will not charge has a new battery
When the engine is running fast idle, the battery voltage should read 13.5 to 14.5 volts if the alternator is delivering charge to the battery. If the old alternator had a shorted diode, the very high current from the battery back through that diode will burn out what is known as a fuse link which is located within the wiring harness and it will effectively disconnect the alternator output from the battery. The battery end is connected at the starter terminal where the positive battery cable also connects.
SOURCE: 84 CK TRK, 2500, 5.7L 55,000 miles have replaced
On some of the older style GM's you can take that brown wire and cut it and take the end leading from the alternator and hook it directly to the hot terminal on the alternator and just leave it hooked up and it will work. But I have ran into the occasional problem where leaving it hooked up will drain the battery when the vehicle isn't running. Hope this helps..
Testimonial: "I fixed the problem - the terminal at the brown wire was corroded - after cleaning and recrimping - everything works - thanks for the heads up"
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