You need to use a voltmeter and poke around to see where you actually do and don't have voltage. Set it on DC, clamp the negative lead to some bare metal, and measure away. I'm betting that if you put the positive lead on the ground side of the motor in any "on" position it will read 12V when it should be ~0V, because it sounds like there may not be a path to ground from that point. A voltmeter adequate for this sort of work is only $10 at Harbor Freight or Home Depot.
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