[ultimateirving]

Ok I'll help. That wire is the 12v switch it turns the compressor on by sending a signal. I believe the compressor grounds itself through the mounts. If anything in the system is off it won't trigger the compress. So if the pressure sensor, which is in the drier I believe, doesn't see the right pressure it won't switch the compressor on. Also the climate control box could be malfunctioning I had to replace my original when I got my ac hooked up