Just hooked up Hadley air horns under the hood (on the radiator cross-member) and have the compressor wired directly to the battery - for now. Does anyone know where to safely pull off 12 volts from an ignition switched power source without tapping into the fuse panel? I will wire in a relay for the true power, but I still need the switched power to enable the relay. Currently my compressor will kick on if the PSI in my storage tank gets too low, even with the ignition off.

 

I'm not sure where to hook into but when you do find out make sure the amp rating of the pump and the circuit you are hooking up to does go over your amp rating of yor fuse or you could have problems.