[de_]

I believe if the fuse in the spike is gone, there will be no light on the spike.

If there is no light, check 1) there is 12v coming into the spike, then check the fuse and if still no light, replace the spike.

If the light on the spike is orange, the spike is not talking to the RC (PWM connector issues). Reseat them. We hot glue them in.

If the light is red, then the RC has not requested the compressor to turn on. Did you guys accidently delete the 2 lines of code in user_routines.c that turns it on ?

If the light is green (RC telling spike to turn on the compressor) but the compressor didn't go on:
Check there is 12 volts on the output terminals of the spike (ie compressor wires). If there isn't, replace the spike. If there is, then the compressor appears to be dead. As a last resort test, connect compressor directly to 12v (ie don't use robot warning harness) and see if it goes on. If it doesn't, its dead!

As a last resort test of the spike, just swap another in.