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There should be a plus symbol on the reservoir. And yeah you can apply 12v directly to the leads to trigger the motor. Reverse the polarity to switch between raise/lower. If you just added fluid then there might be air in the system so you'll need to raise/lower a few times to clear that out.
There is no reset procedure for the top. The computer always knows its position using all the sensors. Maybe have a check at the fuses but yeah definitely gotta be an issue in the wiring harness.
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