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[quote user="BigDaddy"]I assume much will be revealed when I unmount the weight.  In the meantime, would the right side trucks connect to both the motor and circuit board via M- ?[/quote] The answer is kind of to first part, second part no.  The M- just contacts the motor contact clip on top.   Right side trucks feed power via the bolsters directly to the frame.  The copper ring contacts around the lighting board are the give away.  Right side truck power feeds througth the weight to the board.   If you can find a ring terminal small enough (I think that is what they are called), you can immitate the photo that Ed? posted that has the arrow.  If you cant find one, you can make one with a small brass washer by soldering a wire to it.
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