[Al Skierkiewicz]

I know this sounds bad but the speed controllers get very unhappy when the power is connected to the output side of the controller or the power is connected backwards. There is one other explanation, we call it infant mortality. With all the quality controls in place during manufacture, some components will fail shortly after being powered.

For rookie teams reading this post, the metal tabs of the transistors that are exposed on the speed controllers are connected to live circuitry. Do not allow shorts between the tabs at any time. Watch carefully when connecting power to the controller and have at least one other person check your work before you apply power. The neagtive power input to the speed controller is not the same as the "-" motor output. Follow the wiring guide in your documentation at all times when wiring speed controllers and relays.