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1987-93 Mustang 5.0L Replacement Engine Harness Installation Instructions

Last Updated 11/24/2020 by Dustin Leathers

Age, and heat from your Mustang's engine can take a toll on the factory engine harness! The OEM style plugs on our replacement harness allows for a quick, and easy installation!

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Installation Instructions:

  1. Disconnect the battery
  2. Installation will be easier if the upper plenum is removed.
  3. Remove the factory harness, taking note on how the wires are run.
  4. Disconnect the main black, and white connectors at the back of the engine.
  5. Install replacement harness following factory routing. Make sure ground lug has clean metal, and will make good contact to intake bolt.
  6. Complete installation by confirming harness is routed away from exhaust, and any moving parts.
Installation instructions provided by Ron Francis Wiring.

1979-93 Mustang Engine Parts & Underhood Accessories