For those of you who think that Ford left room for improvement, we offer the custom way to update your Mustang's wiring!

1964-66 Mustang
Classic Update Series™ Wiring System (Part # 510125)

Look at everything that's included in this wiring kit!
Detailed instruction sheets also included, but not shown.
(click image to enlarge)

We now offer a new and improved version of our 1964-66 Ford Mustang Classic Update Wiring System (part # 510125). This is one of the most complete wiring systems in the industry. We’ve made a number of improvements to this system, which are detailed below. These improvements make for an even better installation experience and include a number of upgrades. The instruction sheets have also been updated and improved. This wiring system was already the best of its kind prior to making these improvements. Now, it’s even better! See details below:

Dash and Main

• A Bussman fuse box assembly and enclosed case mount in the left-hand door pillar area. Detailed photos of the installed unit are included in the instructions. Mounting bracket, hardware and a mounting template are included. NEW!
• Disconnects have been added for the engine and forward lamp wiring. They plug in under the dash and go out through grommets in the firewall. NEW!
• Can now be used with cars that have Factory Ford underdash A/C. NEW!
• Turn signal connector is for 1969-76 style GM columns. We provide the mating connector and terminals for the customer to adapt to their switch if using a stock Ford column. Corrected and updated tables demonstrate the proper wiring configurations.
• 12v switched and 12v battery radio feeds are included.
• Correct Ford headlight switch and connector.
• Connection to original Ford style plug-n-play wiper harnesses. Addresses the different wiper harnesses available along with detailed drawings and how to tie them into the dash harness (harnesses are not included with kit, but are available from almost all Mustang part's vendors). Instructions for connecting a stock wiper/washer pump are included.
• Correct Ford ignition switch and connector.
• Complete detailed factory heater and heater resistor harness drawings, wires, and connectors included. NEW!
• Complete detailed neutral safety and back up lamp switch leads with disconnect drawings, wires, and connectors included. NEW!
• Console dash connections included that will plug directly into the factory console harness (factory console harness not included). NEW!
• Detailed fog lamp switch connections and drawing are included eliminating previous questions about the stock third wire. NEW!
• Electric fan trigger wire is included in this kit.
• Complete dash cluster disconnect now included along with electric speedo wiring. NEW!
• Typical left and right courtesy lamp housings are provided.
• Cigarette lighter connection is included.
• Relay and connections that control headlights, fog lights and horn are included.
• Glove box lamp connection is included.

Rear Body

• Original 90 degree molded tail lamp socket connectors are included.
• Will accommodate aftermarket tail lamp socket connections. NEW!
• Original bullet style back up lamp terminals and rubber sleeves are included.
• Original fuel tank sender connection lead with the pass-through floor grommet is included.
• Feed wire and mating terminals to original style dome and sail panels lamps are included. NEW!
• Feed wire and mating terminal to original style trunk lamp is included.
• Original style mating terminal to accommodate tag lamp is provided.
• Third brake light wiring also provided in this kit.

Gauge Cluster NEW!

• Original light sockets, ring terminals and connectors to connect to a stock gauge cluster are included.
• Includes feed to optional stock instrument cluster-mounted clock.
• Includes aftermarket tachometer wiring.
• Just as with other similar Ford kits, this kit will not support the use of a factory tachometer (which has the ignition source routed through the tach. assembly).
• Aftermarket gauge wiring terminals and instructions are included.

Engine Harness NEW!

• Complete engine wiring leads out to engine compartment includes: oil pressure, temperature, electric choke, tachometer, 12v ignition.
• Supports a 1-wire alternator and also includes an exciter wire for use with other voltage regulator-style alternators.
• 6 gauge alternator charge wire along with (2) mega-fuses to protect the alternator and main battery feed to engine and dash harnesses.

Front Light Harness NEW!

• Aftermarket 2 post Ford-type late model brake warning molded connector is included in this kit. Directions for connection are included.
• Complete wiring, terminals and connectors to connect to the stock parking lamp pigtails to create a disconnect system. Detailed instructions are included.
• Complete wiring, terminals and connectors to connect to the stock headlights. Relay protected for use with halogen lamps.
• Complete wiring, terminals and connectors to connect to single or dual horns.
• Detailed color schematics and easy to understand installation instructions.

OPTIONAL PACKAGES can be added to this system, depending on your requirements.

• Optional Alternator Conversion Harness - allows use of a Delco CS130-D (serpentine belt, internal fan) series internally regulated alternator - Part # 500295
• Optional Alternator Conversion Harness - allows use of a 1984-99 Delco CS external fan series, internally regulated alternator - Part # VAK6986CS
• Optional Alternator Conversion Harness - allows use of a Ford 3G series internally regulated alternator - Part # 500802
• Optional Courtesy Light Delay Module Kit - Part # 510197
• Optional Hazard Flasher Accessory Kit - Part # 510175
• Optional Terminal Crimping Tool Set - Part # 93963818

Some optional packages may not be available for all year/model vehicles. See catalog for more details.