Painless Performance Complete Chassis Wiring Harness 22 Circuit 1965-1966

Painless Performance:
100% of 100


  • 22 Circuits
  • Factory Ford Color Code
  • Destinations Printed On Wires
  • Features An Auxiliary Circuit
MSRP $1,684.95
You save 47%

Painless Performance 22 Circuit Complete Chassis Wiring Harness for all 1965-1966 Mustangs.

If you are a proud owner of a 1965-1966 Mustang, you can now take comfort in the fact that there is an electrical system upgrade from Painless Performance to completely rewire your classic car. This harness allows you to safely rewire existing accessories as well as connect new, aftermarket items too.

Number of Circuits: 22 Circuits - 12 Fuses w/ Horn Relay, Accessory Relay and Maxi Fuse
Harness Length: Factory Fitment
Fuse Type: Mini Blade & Maxi Fuse
Firewall Passthrough: Grommet
Color Code Based: Factory Ford
Connectors Included: Blower motor, wipers, ignition, headlight switches, voltage regulator, turn signals and flashers, cigarette lighter, brake switch, dimmer switch, brake warning light and headlight bulbs.
Circuit Designations: Printed on Wires

This 22 circuit harness is a direct fit for all 1965-1966 Mustangs and has many of the factory connectors already installed on the harness right out of the box. This harness uses a unique covered micro-fuse block and also features an auxiliary circuit with a 20 amp relay for additional accessories such as fog lights or an electric fuel pump. Each wire is custom printed with circuit identification, as well as the factory Ford color codes being used for an easy installation.

Included Circuits For:
- A/C & Heat
- Accessory / Cigarette Lighter
- Accessory Relay
- Backup Lights
- Brake Lights
- Charging
- Courtesy and Dome Lights
- Electric Choke
- Emergency Flashers
- Fan Relay Activation Power
- Fused Power Source
- Glove Box Light
- Headlights
- Horn (Relay)
- Ignition Coil
- Instrument Panel Lighting and Gauges*
---> *Includes wires for an Ammeter, Fuel Gauge, Oil Gauge, Tachometer, Temperature Gauge and Voltmeter.
- Park Lights
- Radio/Clock (Constant and Switched)
- Starter
- Tail Lights and License Plate Light
- Turn Signals
- Wipers and Washer Pump

So if you are restoring a classic 1965 or 1966 Mustang or have a beauty of your own already that you have had electrical and wiring issues with, this all-inclusive wiring harness from Painless Performance is exactly what you need!

*This will NOT fit 1964-1/2 Mustangs.

Order a Painless Performance 22 Circuit Complete Chassis Wiring Harness for your 1965-1966 Mustang from CJ Pony Parts today!

California Residents: Proposition 65 Warning

Installation Difficulty


Intermediate skill is required for this installation.

Installation Videos

Video Transcript

We’re here with an update on our project 50-30. We’re two months away from SEMA. This will probably be one of the last updates where we can show you the entire car. We have a lot of manufacturer’s on board with this build, and we want to give you brand new products at the SEMA Show that aren’t available to the public, so we can’t show them to you until the car is debuted. Guarantee though, we will be there at the SEMA Show and we’re going to give you a full overview of this car, top to bottom, sitting on the floor at the Las Vegas Convention Center. For now we’ll give you a couple updates on what we’ve been doing.

For our first update we’ll go under the hood, and if you’ve been following the build you know we were talking about reusing Ford Racing’s Coyote Crate engine to power our car. Four hundred twelve horsepower would have been great, but if you remember I said we were going to make it a little be more than that with Project 50-30. Additional power is going to come from a Vortex supercharger. We’re using their block series V3 supercharger to reliably push our car over 600 horsepower. This will work great with the stock motor and the factory computer we’re using.

We also recently installed the front windshield and the rear glass. We’re using one of our glass kits which is available for all ’64-’73 Mustangs, including all the glass necessary for the restoration. They’re available in clear or the tinted smoke glass shown here. If you go with the smoked, only the very top edge of your windshield is going to be smoked. The rest will be clear. We think the tinted glass is going to give our Mustang a really nice custom look with our black roof.

While not necessarily exciting to look at, our last update is going to be the wiring harness. With a custom build like this, having a good harness is going to be very important to make everything operate properly. We’ve chosen to go with Painless Performance Products complete chassis harness, fitting your ’64-’66 Mustang. Two additional models are also available fitting ’67-’68 as well as ’69-’70. The Painless will update 50-30 to modern wiring, giving us plenty of extra circuits to hook up with our control pack as well as all the extra power options we’re adding to our build.

Like we said before, we can’t show you everything, and we still have a ton of cool stuff to show you on our project 50-30, so make sure you subscribe to our YouTube channel for more updates.

Vehicle Fitment

This product will fit the following Mustang years:

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