Mustang Door Light Wiring Harness (1965-1966) Installation Instructions

Tools Required:
  • Pliers
  • Phillips Head Screw Driver
  • Flashlight
  • Drill
  • 90-degree Drill
  • Step Drill Bit to drill 3/4-inch hole
  • 1/8-inch Drill Bit
  • Punch
  • Interior Trim Removal Tool
Install Difficulty:
  • Moderate
  • Moderate Project
1. The new Mustang Door Light Wiring Harness for both doors is installed in the same manner. The location of the holes to be drilled should take into consideration the position of the door hinge, light switch and, if installed, the remote mirror assembly and cables.
Mustang Door Light Wiring Harness Install Image
Mustang Door Light Wiring Harness Install Image
2. Before starting any work on your Mustang, practice safety and disconnect the Mustang battery.
Mustang Door Light Wiring Harness Install Image
3. Start the disassembly process by removing the Mustang door handle and window crank.
Mustang Door Light Wiring Harness Install Image
4. Remove the Mustang door panel and, if installed, the remote mirror plate/screws.
Mustang Door Light Wiring Harness Install Image
5. Remove the Mustang door sill plate and kick plate to gain access to the existing wiring harness and location for drilling 3/4-inch hole .
Mustang Door Light Wiring Harness Install Image
6. The door with the panel and all of the hardware removed.
Mustang Door Light Wiring Harness Install Image
7. Use a 90-degree drill to access the tight areas between the Mustang door and the cockpit areas. We found good success using this step drill bit.
Mustang Door Light Wiring Harness Install Image
Mustang Door Light Wiring Harness Install Image
8. The Mustang door light wiring harness can now be fished through the new holes.
Mustang  Door Light Wiring HarnessInstall Image
9. Connect the Mustang door courtesy light to the quick connection on the harness.
Mustang Door Light Wiring Harness Install Image
10. Remove the Dome Light Switch to gain access to power for the courtesy light.
Mustang Door Light Wiring Harness Install Image
11. Connect the harness to the Mustang dome light switch, and the black/blue wire removed from the switch. Ground the harness to the body of your Mustang.
Mustang Door Light Wiring Harness Install Image
12. This is the completed passenger side installation of the wiring harness.
Mustang Door Light Wiring Harness Install Image
13. Reinstall all of the related door parts.
Mustang Door Light Wiring Harnessm Install Image
14. Validate that everything works and enjoy your new Mustang Door Light Wiring Harness.
Mustang Door Light Wiring Harness Install Image