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I'm only guessing here, but if you would check this out using a meter, I think that you will find 2 wires for the heater, 2 wires for the up/down motor, and 2 wires for the left/right motor. The wires to the motors will reverse polarity for the different directions. I don't know what you've got for a test light, but I would be surprised if it is able to indicate polarity.
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