American Autowire Wiring Harness Classic Update Kit Bronco 1966-1977

American Autowire:


  • Complete Wiring System
  • Gauge Cluster Easily Wired In
  • Compact Ato-Style Fuse Panel
  • Pre-Mounted Flashers & Relay
MSRP $999.00
You save $49.95

American Autowire Wiring Harness Classic Update Kit for all 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976 and 1977 Broncos.

Probably one of the biggest and most feared steps of any restoration is the wiring. Luckily, American Autowire is here to make it easy with this Classic Update Wiring Harness Kit for all 1966-1977 Broncos. This dynamic kit from American Autowire contains virtually every piece of wiring you will need to completely rebuild or replace the existing, worn-out wiring in a classic Bronco.

Classic Update Wiring Harness Kit Features:
- Allows for nearly all aftermarket accessories
- Exclusive American Autowire original style switch connector bodies
- Compact ATO-style fuse panel
- Harness-mounted signal flasher, hazard flasher and horn relay
- Includes under dash courtesy light assemblies
- Ignition switch includes an index connector
Wire length and connection accommodate original floor mount dimmer switch

American Autowire's Classic Update Kit (P/N: 510317) provides customers with one of the most well-thought-out kits on the market, making the wiring process easier than ever. The wiring harness is laid out and formed to allow for nearly all aftermarket accessories such as gauge packages and heat and air conditioning systems. It comes with a new compact ATO-Style fuse panel that is fully encased in a closed box assembly with a cover that mounts inside the glove box (mounting hardware included). The fuse box lid is labeled on the inside identifying all circuits by description and their respective fuse ratings. The instrument cluster wiring is designed with a cluster harness disconnect system for easy service and assembly. Original terminals and connectors are provided for stock cluster connections. The kit’s steering column connectors can plug directly into most aftermarket steering columns or stock 1966-1977 Ford columns using the adapter and terminals included in the kit.

This wiring kit’s rear body harness assembly plugs into the main harness at the left kick panel location and longer leads allow for stock or custom routing of the wires. The rear body wiring includes backup light lead wires and connectors along with stop and taillight lead wires and connectors to mate into the stock Ford taillights and backup light pigtail assemblies.

Wiring Harness Kit 510317 Includes:
- Floor Dimmer Switch
- Practice Terminal Crimping Set
- Ignition Switch
- Fuse, Relay and Flasher Kit
- Dash and Main Harness Kit
- Dash Cluster Kit
- Rear Body Kit
- Headlight Switch
- Windshield Wiper Switch
- Grommet and Parts Kit
- Instructions
- Glove Box Modification Template

American Autowire’s engine wiring includes feeds for coil, tach, water temperature, oil pressure, electric choke and electric speedometer (if needed). A heavy gauge alternator feed and fusible link are also included for any typical high output 1 wire or internally regulated alternator. Connectors are supplied for power and tach leads for GM style H.E.I. distributors along with various oil and temp senders.

Front lighting includes extra-long leads that can be routed for stock or optional appearances. All headlight, parking light and directional light leads, along with a switched trigger wire for an electric fan relay (usually recommended with AC) are provided. Mating terminals and connectors are also provided for you to complete your custom installation.

*This wiring harness does not support the use of a factory ammeter.

Order this 510317 American Autowire Classic Update Complete Wiring Harness Kit for your 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976 or 1977 Bronco from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Installation Difficulty


Advanced skill is required for this installation.

Installation Videos

Video Transcript

We’re here with American Autowire's classic update wiring kit fitting your 1966 through 1977 Bronco.

The American Autowire classic update kit is going to give you everything you need to completely re-wire your '66 through '77 Bronco from front to back. It's going to include a new fuse box with a brand new chassis harness, a new gauge harness, completely new wiring for your lights, front and back, a new ignition switch, a new wiper switch, a new dimmer switch, new headlight switch, and every nut, bolt, wire, grommet, fuse, and relay necessary for installation.

American Autowire is going to include this Ford style electronic wiper switch. This will allow you to convert your vacuum operated wipers to an electronic style. The wiring harness is pre-wired to work with this switch making for a much easier installation.

American Autowire includes really detailed, full color instructions, and every wire is labeled exactly where it's going making what can seem to be an intimidating installation much easier to do.

The American Autowire harness is going to run all of your factory equipment, but also gives you plenty of circuits for additional accessories, including electric fan and electronic ignition.

If you're looking to restore your '66 through '77 Bronco and are not worried about originality, this American Autowire harness makes an excellent upgrade.

Vehicle Fitment

This product will fit the following Bronco years:

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