1984 Ford Mustang 5.0 Carbureted Wiring Harness This is an engine wiring harness for 1984 ONLY 5.0 carbureted Mustang. This is the harness that connects the main harness to the engine. It includes all of the connectors for the following: A/C, ignition coil, oil/temp sending units, connects distributor to ignition module, other misc pieces on motor. 1984 mustang wiring harness | eBay Find great deals on eBay for 1984 mustang wiring harness. Shop with confidence. Skip to main content. eBay Logo: 1983-1984 83 84 FORD MUSTANG GT LX 5.0 LICENSE PLATE LIGHTS AND WIRE HARNESS. Pre-Owned. $10. or Best Offer Four Seasons Cooling Fan Motor Wiring Harness for 1983-1986 Ford Mustang zi See more like this.