American Autowire Complete Wiring Harness Classic Update Kit 1987-1989

American Autowire:
98% of 100


  • Complete Wiring System
  • 175-Amp Mega Fuse
  • Dash Harness Connectors
  • Electrical Upgrade
MSRP $1,269.00
You save $63.45

American Autowire Classic Update Kit Complete Wiring Harness for all 1987, 1988 and 1989 Mustangs.

Make your wiring hookup as easy as possible with one of the most complete kits you'll find on the market. Designed specifically for 1987, 1988, and 1989 Mustangs, this Complete Wiring Harness from American Autowire's Classic Update Kit Series is incredibly simple to understand & hookup, and provides you with everything you'll need to complete your electrical upgrade. Whether you are looking to replace old, worn out wiring or attempting to restore an 87-89 Mustang, this wiring kit will make your operation THAT easy.

Features and Benefits:
- Compact Fuse Box with Aluminum Mounting Plate
- 175-Amp Mega Fuse for Main System Protection
- Dash Harness with All Factory Steering Column Connectors
- New Headlight & Hazard Switch Connectors
- Wiring with New Terminals for Fog Lights & Rear Defrost Switches
- New Door Switches & Connectors
- Designed with a Cluster Harness Disconnect System
- Supports Most Aftermarket Gauge Packages
- Rear Body Harness with New Lamp Sockets
- Engine Wiring Feeds for Coil, Tach, Water Temperature, Oil Pressure, Choke & Speedometer
- Heavy Gauge Alternator Feed & Fusible Link
- Front Lighting Wiring with Extra Long Leads
- New Headlamp, Directional, & Marker Lamp Sockets
- New Washer Pump Connector & Wiring
- Supports Power Windows & Locks
- New Heat & A/C Wiring with Blower Switch & Blower Resistor Connectors
- Provides Ignition Feeds for Aftermarket Ignitions & Fuel Injection ECU's

This complete wiring update kit from American Autowire has tons of features that are easily labeled & identified to help keep you organized in your application process. This wiring kit includes a 175-amp Mega Fuse to keep your main system protected, along with a compact fuse box with an aluminum mounting plate that can be used for the initial and modern mounting locations.

The dash wiring harness has many aspects including all factory steering column connectors already installed and set to simply attach to your factory switches. The harness also features wiring with new terminals that work with your Mustang's fog lights and/or rear defrost switches, as well as new headlight & hazard switch connectors that are pre-installed. A brand new blower switch and blower resistor connectors are incorporated for high-quality heat & A/C wiring. To help with the courtesy lighting, new door switches and connectors are also attached to the dash wiring harness.

The engine wiring is comprised of feeds that go to your Mustang's coil, tach, water temperature, oil pressure, electric choke, and electric speedometer (if needed). A heavy gauge alternator feed, along with a fusible link, are incorporated for any conventional high output 1 wire or internally regulated alternator. The engine wiring is set up to produce ignition feeds for aftermarket ignitions and fuel injection ECU's.

Additionally, this American Autowire complete wiring update features a front lighting kit that has extra-long leads for a stock or custom appearance depending on how you choose to route your wires. The front lighting kit has brand new headlamp, directional, and marker lamp sockets that are pre-installed for a simple connection. A new washer pump connector and wiring complete the front lighting kit.

This complete kit has instrument cluster wiring that is created with a cluster harness disconnect system for painless service & assembly, and works with most aftermarket gauge packages. This kit will uphold your Mustang's power windows & locks with the use of the factory door harnesses. The rear body harness with fresh lamp sockets rounds out this incredible kit that will be sure to upgrade your classic 87-89 Mustang with modern wirework, far superior than its OE counterparts.

*Does not include convertible top wiring.

Please Note: The included harness is not engine specific as it does not have ECU-to-Engine Wiring such as injector harness and mass air. For these reasons and other notes that can be found in the available installation instructions linked on the Installation & Fitment tab, this kit will NOT work with a factory ECU or the factory gauges.

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 Series Complete Chassis Wiring Harness fitting your 1987 through 1989 Mustang.

With the '87 through '89 Mustangs being at least 25 years old, many of them are actually going through restorations. Harnesses and wiring are one of the main problems with these cars because over the years they get cut up, they get changed, and cause a lot of problems for restorers who are trying to put the cars back on the road. This complete chassis harness will give you everything you need for the chassis of any '87 through '89 Mustang.

The basis of the kit is going to be their new under-dash wiring harness. This will work on any '87 through '89 whether it's a 4 cylinder or GT. It will work on all body styles. It will work on a convertible but it does not include the wiring for the convertible top switch. Includes a new fuse block, new switches, and all factory-style plugs, making it a plug and play installation.

For additional protection along with the fuses and the factory fuse block, American Autowire includes this 175-amp mega bus fuse to mount to your main power source before powers goes to the rest of the harness. This is going to be your rear body harness. This is going to give you brand new wiring for everything in the back end of the car, including your taillights, backup lights, along with the fuel pump, third brake light, and the defroster.

The kit includes brand new factory-style sockets that will use the original light bulbs. This is going to be your dash and gauge harness here. This has everything necessary to hook up all your factory gauges to the factory setting units, and it actually has additional circuits built in for adding aftermarket gauges such as a boost gauge.

The last harness here is going to be your headlight harness. It runs the headlights but also runs every accessory in the front of the car, and has additional fusing and wiring built in to run an electric fan. Again, it uses factory-style sockets that will use original-style bulbs.

American Autowire knows that wiring can be very intimidating, so with their kit they include a large selection of full color diagrams showing you where all the connections are made, where all the wires get run to.

If you're looking to restore or you're just working on your '87 through '89 Mustang or having wiring problems, this American Autowire harness is a great idea to correct those issues. Keep in mind, this is just a chassis harness, does not include engine wiring such as the injector harness or the main ACU harness.

Vehicle Fitment

This product will fit the following Mustang years:

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