04-21-2014, 07:37 PM
The speed selector regulates how much voltage gets to the motor thus changing the speed. It's basically a potentiometer and they can wreak havoc. That is of course if your controller has the slide speed selector. It sounds like that is your problem. Either that or you've got a bad ground or the motor is wore out and pulling too much of a load and heating up the pos wire. Hope this helps
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