Originally Posted by KevinNY
I installed my compressor and am wiring it all up today. My question is where to tap the red-yellow wire from the harness into the ignition? Which wire? This is on a SeriesIII.
You do not need to wire it to the ignition switch, just a wire that is hot when the ignition switch is on.
This works ok, but disengages the locker and compressor when you shut the truck off even with the compressor switch on.
So if you want the locker to help when you change a tire or park on uneven ground, you have to leave the ignition switch on.
I added a dedicated switch to activate the system wired from a constant hot so I can switch the system compressor / locker on anytime.