Unfortunately I have lost almost every picture of my conversion of an x3 thus far. This includes the picture I took that shows where the wires go from the forward/reverse switch to the spindle motor. I have a few things disassembled now and do not have the stock potentiometer so I cannot test which terminals are correct. Can anyone just quickly look in the back of their x3 and tell me where the motor's positive and negative wires go to?