You may want to use a heavier gauge wire for this circuit. It pulls a lot of amps when running. Personally I ran a fused 10 gauge wire from the battery directly to the the power top motor and set up a relay system. 12 gauge likely would have been OK too but I had the red 10 ga. on hand. I am using the original 43 yr old wiring (will need to replace someday) and I found 8 volts at my freshly rebuilt power top motor when running. Lower than design voltage is hard on any elect. motor, so i set up the relay system. Now its a full 12V when running.