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Originally Posted by greg schroeder
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Correction, sorry
According to Roush this would be the alternator on a 427R. It looks to be a GM alternator.
Powermaster 17294
I've now researched the problem.
The single wire from alternator in a round about way goes into amp gauge and then out to battery. The full load is being sent through the amp gauge. All that I talked with, including Powermaster, said don't do that.
My problem more than likely began because the wire out of the amp gauge going to the battery was loose and connected and disconnected at random. According to Powermaster when the wire is disconnected from the battery this is what spikes the gauge. It's a bad condition which is very hard on the voltage regulator inside the alternator.
My alternator tested to be delivering 15.8 volts. The internal voltage regulator is fried.
I ordered a new Powermaster 17294 from Summit. I'll install it and give a report as to the result soon. I'm reasonably confident this will resolve the issue. I'm going to bypass the amp gauge and use a volt gauge instead.