Started installing this thing yesterday and I'm still not done. Sheesh.
It's going to require cutting some factory harness wires which I'm super uptight about, so I'm going full OCD on the install.
First, I didn't want to just bolt it to the fender, I wanted to isolate it via rubber mounting. So I made a few trips down to ACE Hardware to get the right combination of grommets and rubber fender washers. Fender washers for the fenders. Ha.
And of course the mounting bolts are *under* the compressor.
Then, of course it's always a bit of a pain to pull dash bezels and panels. Then pop the switch blanks and trim the holes to accept the ARB switches. No biggie, really. But a bit time consuming.
Read the ARB wiring harness schematic and install guide. The ARB switch illumination light calls for variable input voltage but returns it to ground. But the tacoma's variable brightness rheostat alters voltage between "out" and "in" on the rheostat (green and green/white.) So I made up a little lighting harness that'll just put the ARB switch bulbs in parallel with all the other var-level lights, skipping the 'light' function of the ARB.
Then, the main input to the ARB wants to be on a 10A ignition switched circuit. The most convenient one I can find (remember I *hate* probing and cutting factory wires) is the ignition switched input to the variable rheostat which is on a 10A fuse - but it's a 22 gauge wire! I'm pretty sure that if ARB is axing for anything above about two amps, it's gonna smoke that little wire. Now, that provides power to a relay for the main compressor, but also the differential "air" solenoids. The air solenoids are the ones I'm worried about. So it's probably overkill but I wired up a separate relay to power the ARB harness that is itself activated by that 22 gauge light-green.
I'm probably proceeding with a ridiculous amount of caution on the wiring, but I've had the experience of having a BCM (body-control-module) fail on a brand new car shortly after having a "pro" wire in an aftermarket stereo.
And I never Ever EVER want to have that happen again.
I'll post up an install thread with pix after it's all done.