So.. I am going to use the ac compressor for my onboard air setup. Plan to install a tank with pressure switch, relief valve, check valve and drain valve. Will do the grease mod on the compressor. Will have a female quick disconnect on the tank. Will also build a rig to hook up to each tire tee'd into a block with a gauge, a valve to atmosphere, and a male disconnect. The rig will let me air up or down all four tires at the same time to the same pressure.

Only thing I haven't figured out is the control circuit. I would like to use the stock wiring. My thought is to install a switch in the interior to the stock wiring for the ac. That will allow me to utilize the OEM circuit to turn on the fan and bump the idle up. I have a 90 (Renix), keep that in mind for the wiring. I would like to use the wiring for the ac low pressure switch for the pressure switch in the air tank. This is where my electrical knowledge gets a little fuzzy. I THINK the ac low pressure switch is NO while the air compressor pressure switch is NC. My thought is to use a relay to convert the NO to NC. Or keep it simple and jumper the low pressure switch and cut the air compressor pressure switch into the power feed to the compressor.

Thoughts? I am trying to keep this simple and reliable.

 

First question: Where are you getting the power?

 

All four tires to same pressure. I run my fronts higher than rear, as front weighs more.

 

I'm getting power from the OEM circuit that controls the AC. The slider that turns on the AC.

 

Oh, I get it. Sorry I thought you were running it off electricity. You need torun it off a pressure switch that is mounted to tank or in line. That is what should power the clutch

 

I got the electrical sorted.

I snipped the green w/ white strip wire from the back of the HVAC control switch and ran it to a switch. I then plugged my pressure switch into the plug for the ac low pressure switch, the plug is the same! Now I can control the compressor on/off from the dash and the compressor comes on, idle kicks up, and the electric fan comes on. When the tank hits pressure, the compressor cuts off.

 

current source to the switch, to the pressure switch to the compressor