No, don't take it apart. If it's several hundred kOhm, I'm sure that's fine. That can just be related to the volt meter sometimes. My fluke can show several hundred kOhm, or infinity, measuring the same 2 points at different times. The leakage from that would be very small. I think your short to the chassis is somewhere else... It could be the motor causing it too. Sometimes carbon dust can make a connection where it shouldn't. Try the motor posts to the car frame also, and then each battery post to the frame of the car. It's got to be somewhere... I love mysteries like this.
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