Quote: If 15.1-15.2 at the battery is too much, then is there anything else besides the VR that could make it charge this high? I have a new AC Delco voltage regulator waiting to go on if needed. My current VR is an Echlin unit and the previous one was the same model number. Both Echlin units made the same reading on the inside voltage gauge.
I didn't read the rest of the thread, but to me, 15.1-.2 is too high. I bet the blue wire at the alternator is .6-.7v lower than the battery voltage, causing the regulator to pump the voltage that much higher. This is caused by the resistance in the connections between the battery and the blue wire (bulkhead, etc).
You can measure this difference, and if you jump the battery + directly to the blue wire at the alternator, you should go back to 14.5ish at the battery.
Have to go now, but I can post a diagram later if that would help.
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