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A/C Compressor

Electrical and Electronic

Vehicle Information: Model: 911 Carrera; Year: 1986; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 87000;

I just had my A/C unit coverted from R12 to 134. I can get the fan to run along with the rotory switch for the A/C but the compressor will not engage. I hot wired the compressor direct from the battery and it engages. I know there must be a short somewhere, but I'm finding it impossible to locate. Any ideas or shortcuts?

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