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I am having a similar issue. After installing a new alternator, the voltage is not up with the engine running regardless of engine speed. How do I diagnose the Power Control Module?
I'll second that, my 99 1/2 ton is having the same problem. I've tried 2 different alternators and it goes dead in about a day. I'm going to check for a draw on it but I'm leaning towards the computer being junk.
