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So do you want it to bump up whenever the compressor is engaged?
You can use a relay to give yourself a ground (instead of 12v) if I'm understanding your issue correctly. I had to do that with my PF4.
Just splice into the compressor 12V to the relay (Pin 86) and ground 85, so the compressor is activating the relay coil. Then run a ground to 87 and 30 to your black wire, so that when the relay closes, Pin 30 gets a ground. (IF I understand your problem).
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