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I am trying to wire up an A/C from a 99 mustang transplanted in a 69 Mustang. I mainly need to know which wires do what on the A/C circuit. I have a 4 pin switch mounted on the accumulator and a two pin on the high side ( I think ). I wont be using the CCRM a it doesn't exist. I have found a few diagrams, but they all show the PCM, Im sure it can be wired stand alone.
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If you can read electrical line diagrams there should be a copy of it on the inside cover of your furnace.just follow the lines. if they cross they are not connected, if they cross and there is a "node" (dot) at the cross then they connect

the terminal strip on your circuit board will be labeled with the same letters on your thermostat and the wires should match the corresponding letters on both..
 
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