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Steve:
You are correct. When you turn on the lights, A/C radio etc. with the engine running the voltage drops into the 12.6 - 12.8 range. I am going to replace the alternator again under warranty and see if this solves the problem.
By any chance do you happen to know what function / system the plug on the alternator serves? There are three wires on the alternator. The thick cable and red wire (with the eye connector) that is bolted to the back. The other wire (blue) is terminated with the black mercedes benz connector which plugs into the back of the alternator. It travels back into a wiring harness. Do you know what this wire supports or what its function is related to the alternator?
PB
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