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Originally Posted by Denman
Thirdly
Would it suffice to use a simple relay from the battery to stop the speedcontrollers being overloaded backwards?
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This sounds like you have the Spike wired to the speed controller for some reason. If this is the case that is why the controllers keep frying. The implication is that you have a spike wired to the output of the controller to prevent backfeeding the controller. That also is unnecessary as the controller is designed for that. As a matter of fact, you can select the controller to brake the motor when not driving or allow it to coast depending on the jumper select on the controller.