[VetteVet]

Originally Posted by Bisblue

I have run a drain test on other vehicles, but thanks for the advice.

The battery is brand new and I had them test it as well.

I figured you knew how to do the drain test, but I like to post it anyway for any readers who might not know. You said you were drawing 8.2 volts at the alternator on the white wire with the key off. You should not be getting any draw there with the key off. Do you suppose that the jumper from LMC is connecting it with the red wire in the external regulator plug instead of the brown wire which it should be jumping.Try unplugging the LMC jumper from the external regulator plug and see if the drain stops.

The correct voltage at the alternator plug is 12 and 12 with the key on and 12 red and 0 white with the key off . This is with the white alternator plug out of the alternator.