Was at the Goodguys car show today & came across an adjustable thermostat for the spal fan I have. Right now I have it hooked up with a manual switch & relay setup. The fan control unit I bought has only 3 connections 1 for the fan motor,1 for 12volts & the other I don't know what it means. It says the last wire goes to the compressor coil. Can anyone help me out with that. I assumed there would be some sort of ground & thats what this wire is for, but I'm not sure.
