Likely comes from a relay. But forget that wiring and bypass it with new. Get an automotive relay and some wire, splice it into the existing wiring where you loose a follow on connection. Add your own connector and route it up to the A/C switch on the dash. Another wire would feed the relay with 12V power via heavy gauge wire. The switch operates the relay, the relay applies strong battery voltage to the compressor.
Bypassing an electrical problem with new circuit is pretty standard operating procedure. Saves time and money.
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