I bought this along with a motor and batteries but I'm using an OpenRevolt controller for my project so I don't need it. Relay board has a main contact coil, forward/reverse coils, fuses, etc. Includes SevControl speed input control, Forward/Reverse switch/handle and associated wiring harness...

This transformer/coil tutorial is the best that I've found on the net so far. Talks about the process of selecting cores and winding coils and transformers in plain language. With this I think I can finally start working on the magnetics I need for chargers, DC/DC converters, and other power...