Wiring Harness Headlight To Firewall 1966

CJ's Part Number:
WHL3
Wiring Harness Headlight To Firewall 1966 is rated 4.6 out of 5 by 13.
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Highlights

  • Made In The USA
  • Direct-Fit Replacement
  • Factory Style Connectors
  • Fits 1966 Mustang
MSRP $97.85
$89.99
You save 8%

Headlight to Firewall Wiring Harness for all 1966 Mustangs.

If you're restoring a vintage 1966 Mustang, then you probably already know just how frustrating and difficult it can be to trace faulty wiring. So make sure to pick up this Headlight to Firewall Wiring Harness to make your restoration project even easier!

Features & Benefits:
- Direct Fit Replacement
- Connects Headlight, Parking Lights, Horns, Voltage Regulator, Solenoid and Plugs into Alternator Harness
- Correct Color Wires
- Factory-Style Connectors
- Connects to the Firewall Near the Master Cylinder
- Runs Along the Driver Side Inner Fender Apron and Across the Radiator Support

This Headlight to Firewall Wiring Harness is a direct fit replacement. It connects your headlight, parking lights, horns, voltage regulator, solenoid and plugs into the alternator harness. It features the correct color wires as well as factory-style connectors. This harness connects to the firewall near the master cylinder and runs along the driver side inner fender apron and across the radiator support.

Chances are, your 1966 Mustang wiring is due for a replacement. Worn-out wiring can cause major, more costly issues later on. It’s best to replace your aged wiring now, especially if you’re adding new upgrades to your classic car. At CJ Pony Parts, you’ll find original wiring replacements, modifications, stellar upgrades and more!

Order a Headlight to Firewall Wiring Harness for your 1966 Mustang from CJ Pony Parts today!

Installation Difficulty

Moderate
Moderate

Intermediate skill is required for this installation.

Vehicle Fitment

This product will fit the following Mustang years:

  • 1966
Rated 4 out of 5 by from Good fit but plugs need mods I bought this harness in Feb 2017. The wiring fit very well. The problem I ran into was with the plugs. I was not able to get the firewall plug to engage. After much checking I discovered that there were small dimples in the sidewall of the female connectors (tube) which prevented the male plug from going in. I am sure this dimple is meant to engage in the male plug and keep it from coming loose, but it was too high and required WAY too much force to engage. I took a drill bit that was just big enough to remove this protrusion and ran it into all the female plugs, and this allowed the plugs to engage properly. Only a very tiny amount of metal was removed. The original female plugs did not have the dimple/protrusion. Otherwise, this harness was great.
Date published: 2017-03-23
Rated 5 out of 5 by from Excellent Step by Step Directions I installed this wiring harness because I put in a new alternator and it burned out the connection between the old harness and the old alternator harness. Removing the old and installing the new took about 5 hours and I wasn't hurrying. As an added bonus the headlights used to flicker but with the new alternator, voltage regulator, and this harness that problem was solved too.
Date published: 2016-08-15
Rated 5 out of 5 by from Nice Product - needs wiring diagram This is a high quality replacement for the factory harness. Connectors are great and length is perfect. However, it would be nice to include wiring instructions. Needed to scour internet and old service manuals to get the color coding correct.
Date published: 2017-07-14
Rated 5 out of 5 by from Really good product Hello, I have just received, in record time, my order for a 1966 headlight wiring harness. It is exactly what I needed. Thanks to all the team of CJ since France See you soon.
Date published: 2015-03-18
Rated 5 out of 5 by from Perfect fit This harness was perfect .my son and I installed it in 2 hrs
Date published: 2015-10-14
Rated 5 out of 5 by from no need to use drill I was having trouble with the plugs not going together just like the other review said. I really did not like the idea of using a drill on the new harness and I did not want connections too loose. I found out if you take a heat gun and just heat up the rubber connector for about 15 seconds it will allow the rubber to move enough and the plugs will go together fairly easy.
Date published: 2018-11-01
Rated 5 out of 5 by from Prefect fit Just installed. All connected to headlights horn voltage regulator and solenoid perfect.
Date published: 2018-01-25
Rated 5 out of 5 by from simple installation of 65-66 wiring harness Finally got round to installing this kit. Took around an hour and so easy. I took off the old harness as i was installing the new kit so i didnt make a mistake. The kit is a really good buy. Would recommend. Another thing when re-connecting the old harness i came across some spliced wiring and re=routed wires to park lightds. These now work correctly again. Result..
Date published: 2018-09-30
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Is anything like this 66 headlight to firewall harness made for a 1984 GT 350, 5.0, 5 speed?

Asked by: Dicks GT
We do not offer one.
Answered by: rk cjpp
Date published: 2017-10-31

Will this wiring harness also hook up to the GT fog lights I purchased?

Asked by: Mustang Rebuild
The fog light harness is separate, here is the link. http://www.cjponyparts.com/fog-light-wiring-kit-1966/p/WFWK2/
Answered by: rk cjpp
Date published: 2016-05-23

Does this harness include the plug for the voltage regulator and the alternator?? 

Asked by: rjc69
This includes the voltage regulator plug and the plug for the alternator harness, the alternator harness is WALT3A for a 6 cylinder and WALT3B for a 8 cylinder.
Answered by: rk cjpp
Date published: 2016-09-20

How do I receive the points you talk about? From what I have ordered in the past, I have not received any points. Thanks

Asked by: Bama1
You receive points on every order. However, points do expire, so if you don't redeem them in time, they disappear. You can see the amount of points you've accumulated by logging into your account from the RPM club page: https://www.cjponyparts.com/customer/account/rpmclub/. That page also shows when the next expiration date is.
Answered by: CJ Pony Parts
Date published: 2015-10-02

With this harness, would I still need the headlight power upgrade harness, or is that basically built into this harness?

Asked by: Sixtringfling
They're for two different purposes. This harness is a factory replacement for your front lights, while the headlight power upgrade harness is specifically for adding more powerful headlights.
Answered by: CJ Pony Parts
Date published: 2015-07-06

What brand makes this harness?

Asked by: 66Coupe
This is unbranded, so it could come to us from several different manufacturers.
Answered by: CJ Pony Parts
Date published: 2015-04-09

will this work for a GT?

Asked by: scottylou
It works for all 1966 Mustangs.
Answered by: CJ Pony Parts
Date published: 2015-05-14
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