Compressor Not Activating

[Jon Stratis]

You'll have to do some looking at the robot to figure out where the problem is.

First, look at the pressure switch. Pull the PWM cable from the digital side car and measure the resistance between the ground and signal wires that lead to the pressure switch - you should read 0 ohms, or something very close to it. If not, then the switch or the wiring to it might have a problem.

Next, look at the Digital Side Car. There's a row of LED's next to the relay outputs - one of those (the one next to the port you plugged the compressor relay into) should turn on when you expect the compressor to turn on. If that's happening, then everything looks OK in the code. If not, you'll have to dig into the code.

If the DSC light is going on like you expect, take a look at the relay next. The LED on the relay should change from orange to green when the LED on the DSC comes on. If it doesn't, then you have an issue with the wiring somewhere - check to make sure the PWM cable is plugged in all the way and hasn't worked itself loose.

You did replace the fuse in the relay with a circuit breaker, right?