Weird behavior from a Spike

[vgdude999]

So we've wired a ring of LEDs to a spike. The positive and negative are correct, we've tested them directly. When I set the spike to kOn, just as I did with another spike (which works fine), nothing happens, and the light on the spike turns off. Then, when I send it kOff, the light flashes and the fuse trips. If I send it kOff again, the breaker trips again, and I can do this as many times as I want (obviously I don't want to do it at all). The LEDs also flash when I do this.

I tried many things: replacing the fuse, replacing the entire spike, replacing the PWM, continuously sending kOn, etc. Eventually I was completely stumped. At this point I decided to change the direction of one side of the PWM cable, just for giggles (the PWM was now connected correctly on one end and wrong on the other). Much to my surprise, the spike worked perfectly.

Does anyone have any idea as to why the spike is behaving this way?