---
product_id: 50897125
title: "Painless Performance 20120 Direct Fit Mustang Chassis Harness (1965-1966) - 22 Circuits"
brand: "painless"
price: "€ 1371.71"
currency: EUR
in_stock: true
reviews_count: 4
category: "Painless"
url: https://www.desertcart.ie/products/50897125-painless-performance-20120-direct-fit-mustang-chassis-harness-1965-1966
store_origin: IE
region: Ireland
---

# Upgraded ATO bladed fuses & 6 gauge charge wire Full color installation manual 22 circuits direct fit Painless Performance 20120 Direct Fit Mustang Chassis Harness (1965-1966) - 22 Circuits

**Brand:** painless
**Price:** € 1371.71
**Availability:** ✅ In Stock

## Summary

> ⚡ Wire your Mustang like a pro — effortless power, zero compromises!

## Quick Answers

- **What is this?** Painless Performance 20120 Direct Fit Mustang Chassis Harness (1965-1966) - 22 Circuits by painless
- **How much does it cost?** € 1371.71 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/50897125-painless-performance-20120-direct-fit-mustang-chassis-harness-1965-1966)

## Best For

- painless enthusiasts

## Why This Product

- Trusted painless brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Premium TXL Wire:** High strand count copper wiring with abrasion-resistant insulation ensures long-lasting reliability.
- • **Modern Fuse Upgrade:** Say goodbye to fragile glass fuses with durable ATO bladed fuses and a midi fuse for high amp alternators.
- • **Auxiliary Power Ready:** Includes a 20-amp relay circuit perfect for fog lights, electric fuel pumps, or other accessories.
- • **Plug & Play Precision:** Pre-terminated connectors and Ford color-coded wires make installation effortless and error-free.
- • **American Made Excellence:** Proudly crafted in Fort Worth, TX with expert technical support just a call away.

## Overview

The Painless Performance 20120 Direct Fit Mustang Chassis Harness is a 22-circuit, factory-style wiring solution designed specifically for 1965-1966 Mustangs. Featuring printed circuit IDs, Ford color codes, pre-installed connectors, and upgraded ATO bladed fuses with a robust 6 gauge charge wire, it simplifies installation while enhancing electrical reliability. Made in the USA with premium TXL wire and backed by expert support, this harness is the ultimate upgrade for classic Mustang restorations.

## Description

This 22-circuit direct fit 1965-1966 Ford Mustang wiring harness has many of the factory connectors already installed on the harness out of the box. This harness uses our unique covered micro-fuse block. Also featured is an auxiliary circuit with 20-amp relay for accessories such as fog lights, or an electric fuel pump. Each wire is custom printed with the circuit identification as well as using Ford wiring color codes for easy installation.

Review: great product working fine the other wire harness i got from ebay
Review: Se ve de muy buena calidad , viene todo identificado para una buena instalación y hasta los focos del tablero incluye, me gusta que trae ambos arnes para cluster de 65 y 66

## Features

- Printed Wiring and Full Color Installation Manual: Every wire is printed with the circuit identification and uses Ford color codes for easy installation; Paired with the highly detailed full color installation manual, Painless makes a tedious task simple
- Upgraded ATO bladed fuses: Leave antiquated glass fuses in the past where they belong and update to modern bladed fuses; 6 gauge charge wire and midi fuse (no more problematic fusible link! ) will keep up with today’s high amp alternators
- Most of the work is done, with Painless direct fit wiring, nearly every connector is already terminated and installed, making for a simple installation
- When reliability and performance can't be compromised, you want TXL Wire - not the inexpensive primary wire you find in other harnesses; High strand count copper and high-quality insulation makes for high abrasion resistance and easy routing
- American Made, American Proud Since 1990: Every Painless harness is proudly produced in Fort Worth, TX, where we also staff our unmatched Technical Support department. ; Need help during install…simply give us a call

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0006HJP0I |
| Best Sellers Rank | 481,739 in Automotive ( See Top 100 in Automotive ) 1,495 in Car Aerials 5,467 in Car Ingition & Tools 31,628 in Car Engine & Engine Parts |
| Brand | Painless |
| Customer Reviews | 4.3 4.3 out of 5 stars (15) |
| Date First Available | 5 April 2007 |
| Exterior | Painted |
| Item Weight | 3.42 kg |
| Item model number | 20120 |
| Manufacturer | Painless Wiring |
| Manufacturer part number | 20120 |
| Model | 20120 |
| Product Dimensions | 36.83 x 26.04 x 13.34 cm; 3.42 kg |

## Images

![Painless Performance 20120 Direct Fit Mustang Chassis Harness (1965-1966) - 22 Circuits - Image 1](https://m.media-amazon.com/images/I/81WVw0hpkVL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by T***L on 11 April 2025*

great product working fine the other wire harness i got from ebay

### ⭐⭐⭐⭐⭐ Review
*by Y***Y on 21 January 2025*

Se ve de muy buena calidad , viene todo identificado para una buena instalación y hasta los focos del tablero incluye, me gusta que trae ambos arnes para cluster de 65 y 66

### ⭐⭐⭐⭐⭐ Review
*by T***3 on 18 July 2014*

This is a great way to repave you entire wiring system for beginners. It also has ways to add more advanced accessories. The Painless Customer Service is very helpful. If you need to replace your wiring this may be your way to save the EXPENSIVE charges at an auto repair shop.

## Frequently Bought Together

- Painless Performance 20120 Direct Fit Mustang Chassis Harness (1965-1966) - 22 Circuits
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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-05*