I just got my '95 Aspy this last October, and wondered why the Output function of the air compressor didn't work the one for the air hose. I pulled the switch and cleaned the contacts; but wasn't convinced that that was the problem. So using on of the online manuals I read the wiring schematics and saw that one wire ended up at the ignition switch at the park position. That was it; it only works with the switch in Park! Maybe this was in some manual but I had never seen it. Hope this helps someone.