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I've had similar experience in that when the error occurs the voltage is 12.7 but when the error is not there it is 14.3 ..like yours. I somehow assume this is because the error shuts off the HV battery from charging the the 12v.
When you say 'AG says all to be covered.." who is AG? I would have liked it if my local dealer in Trinidad would even look at the car.. but they refuse! since they haven't brought in any electrics as yet. I'm still hoping to change a cell supervising circuit and see if this works.. but I know pulling down this battery train will not be easy.. particularly with those cooling lines!
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