I have power at the relay, pressure switch and at the compressor but it won't engage. I ran a jump wire directly to the compressor from the battery (12v) and it still didn't engage. Is there anything else to check before I replace the compressor?
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Check your compressor ground. If you put power and ground to the compressor with out any results, most likely your Compressor Clutch is defective, which means you need a new Compressor.