Here are the parts for the low voltage control for the wench. Switches are from Digi-key, rated sufficiently in case I end up wiring everything 120 vac. Two normally closed SPST for the up and down limit switches. Two DPDT, (on) - off - (on) switches for control on either side.
I plan to wire in the 5 vdc usb chager to the wall socket side, hopefully with some spade connectors. This will power the two relays which are normally open and active low. That means the enable line just needs to be grounded to close the contacts. So the limit and side control switches are just grounding one side or the other to go up and down.
My plan is to use a 4"x4"x4" junction box to house the usb power supply, the relays, and the motor cap from the yellow handle. That cap just needs to be wired across the blue and white wires from the motor.
I'm still working out in my mind how I might implement some kind of minute adjustment for the limit switches should it prove necessary. Perhaps in addition to angle brackets there could be a bolt threaded through the bracket with a lock nut on top. The bolt head would then make contact with the switch.
