compressor wiring harness | eBay Find great deals on eBay for compressor wiring harness. Shop with confidence. Skip to main content 87-93 FORD MUSTANG LX GT 5.0 A/C COMPRESSOR DIODE WIRE WIRING HARNESS LOOM B321. Pre-Owned. $35. Watch. Air Lift 3H/3P Second Compressor Wiring Harness # 27703. Brand New. 5.0 out of 5 stars. 6 product ratings - Air Lift 3H/3P Second How to Connect Wiring to an AC Compressor | Hunker While wiring a compressor, there are a number of things to consider for a proper electrical hook up. A main concern is the amperage requirements of the compressor. This dictates the size of the wires. Another factor is if the compressor is single-phase or three-phase power. This dictates the configuration of the wiring.