Some electrical questions

[Nathan]

I just realized why this won't work. Forgive my stupidity, I'm not an electronics guy.

The motor's speed controller has three inputs, black, red and white. I was hooking up a battery to the black and red inputs and the PWM signal from the vex controller to the white. I now realize that this setup won't work because the PWM cable doesn't have it's reference to ground, is that correct?

Is there any way I can give an alternate source of power to the motor with just these three inputs?


Thanks for the help,

Nathan