it all depends on if the trim motor is a two wire or three wire motor. If its a two wire, the ground is always constant and the up and down are set by the solenoids or relays. If it only has two wires, then the at rest position of the relays need to be to ground, when the relay is activated, it breaks ground before allowing the voltage to feed thru, the opposite relays is supplying ground to the motor while the activated relay supplies the power. You can use the small auto style "cube" relays if you get the correct ones
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