I bought a electric bike for $500, the motor and battery are good but the electric components are not. The on/off switch has died. Trying to match plugs 2pin red higo/julet? Has been impossible. I’d like to upgrade the controller,throttle, PAS system (the current one has only one setting, super torpedo) not sure what kind of controler & components are best suited. 36V 7aha 250watt. I can wire & sodder (if need be)… Manual breaks. Any and all help appreciated.