"18-CIRCUIT GMC/CHEVY TRUCK HARNESS #10205 for 1973-87 Chevy/GMC Trucks- Uses a factory-style bulk head connector and GM connectors. For 2X4 & 4X4 trucks. For 1967-72 GM trucks with factory a/c also use (60123). This harness includes the following circuits:A/C, Heat, Brake Lights, Coil, Horn, Electric Fan, Emergency Flashers, Gauges, Dash Instruments, Headlights, Radio (constant and ignition hot), Turn Signals, Wipers, Dome Light, Tail Lights, Third Brake Light, Power Door Locks, Power Windows, Accessory Plug, Electric Fuel Pump, Backup Lights, Cruise Control, Electric Choke, and Power Antenna."

>> Click here for 18 Circuit GM 2X4/4X4 Truck Wiring System (73-86) .

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