TrickyT
Hate that mud...
The factory subwoofer uses a 20A fuse (labeled #2 Radio, in the main fuse block in the engine compartment) and the factory wiring is sized accordingly. I don't remember seeing the connector and wiring for the woofer speaker switch last time I was inside the console, but it doesn't matter because this switch did _not_ switch the 20A power circuit. Rather it was only a signal that went back to the amplifier in the rear telling it to turn on. Now ARB says its twin air compressor, p/n CKMTA12, draws 56 Amps at maximum air flow. So there's no way you're going to be able to use the subwoofer circuit to run the air compressor. You need to run dedicated wiring that is fused near to the battery.