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Here is a couple of drawings I found in an AC thread that was posted a few years ago. Hopefully these help out. The first one is the drawing with Red Dot part numbers and has 4 pages, the second is the circuit diagram.

Here is the description of the valve I used. Haldex Midland Manifold Valve 3064940 Parking Brake Trailer Air Supply Military Should be available on the popular auction site for under $10. Also here are the spec from the A/C unit drawing, the Gen 2 is the R-5760-0

If you are using a trinary switch, the blue leads are for the fan and the black are for the compressor clutch. The switch I used didn't come with any instructions but these seems to be the standard.

I have Gen2 and it's operating fine, I guessing you have a wiring issue. Did you use a binary or trianary pressure switch and how did you wire up the compressor and fan? Here is how the wiring should be connected Gen 2 Evaporator Single pin connector --> connect directly to ground if you want...

I originally thought the wire would tap directly into the fording switch however after spending a few hours checking the truck wiring schematics that doesn't seem possible since the fording switch isn't switching the ground side of the circuit. I think it could still be done using a normally...

Bikeracer917 or anyone else who has installed AC, did you ever figure how to hook up the black wire via the fording switch to disable the condenser fan operation? I am in the process of installing my Gen 2 unit and am working to get the electrical sorted out. It doesn't look as simple as...