57 Chevy Wiring Diagram - Wiring Diagram Schemes Wiring Diagram 57 Trifive Com, 1955 Chevy 1956 Chevy 1957 Chevy Chevy Wiring Harness Diagram 57 Chevy Wiring Diagram55 Chevy Truck Wiring Diagram - Relays generally have 4 pins (marked 85, 86, 30, 87) or 5 pins (85, 86, 30, 87, 87a). For most automotive relays, pins 85 and 86 are the coil circuit (and takes 12 Volts to activate the 'switch' - assuming a 12V rated relay, of course!).. Question: I'm experiencing a problem with my A/C compressor. It's never engaging when I hit the button to turn it on. I stopped at a car shop yesterday and they told me it's charged with Freon and that they think it is an electrical problem..
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