[Matt C]

If the thing in your Spike is yellow and looks like the one on the right (sometimes there are even a few scorch marks), your fuse has blown and you should replace it with a breaker (black "box" with 20A written on the top). If it looks like the one on the left, you should still replace it with a breaker, but your problem most likely resides elsewhere. If you are already using a breaker, something else is incorrect. (check PWM cables, power leads, programming).