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I'd first disconnect M+, B-, and B+ bus bars from the battery pack and the motor. Also, just for the heck of it, disconnect the 5 low voltage wires that go to the control board too. Then measure resistance from each bus bar to base plate. If you want to be really thorough, maybe do the measurement with the whole controller out of the car, just sitting on a piece of wood or something. In that context, the resistances should be infinity. The isolation sticky pad stuff can insulate from 7000 volts.
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