My Squarebody and I need your help. I found a connector on the firewall that are missing the other part. One side come from the compressor (dark green) and goes to that connector and then to the pressure control switch. From that PCS goes a light green wire back to that connector. The second light green wire on the same spot of that connector goes back inside the cab to the regulation switch of the AC Unit. BUT where goes the missing connector with the light green wire of the other end that is missing? If I look at the wiring diagram then it shows that the connector 66 light green goes to a fast idle solenoid?! What is that and where to find it. I have a 1984 K20 3/4 Ton with a 6.2l Diesel engine.
Here are the pictures.
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