American Autowire Complete Wiring Harness Classic Update Kit 1965-1966

American Autowire: 510125
MSRP: $659.00
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American Autowire Complete Wiring Harness Classic Update Kit 1965-1966
American Autowire Complete Wiring Harness Classic Update Kit 1965-1966 American Autowire Complete Wiring Harness Classic Update Kit 1965-1966 Play American Autowire Complete Wiring Harness Classic Update Kit 1965-1966 Video 1
American Autowire

Product Description

American Autowire Classic Update Kit Complete Wiring Harness for 1965-1966 Mustangs.

The Classic Update Series is a complete wiring system in a box, giving you everything you need to modernize your classic Mustang's wiring system. Allows for most aftermarket accessories such as: gauge packages, heat and air conditioning systems, power windows, etc.

American Autowire's Classic Update Kit's instrument cluster wiring is designed with a separate "cluster harness disconnect" system for easy service and assembly. The best aspect of the disconnect system is that any gauge cluster package can be easily and neatly wired in. This includes JME ENTERPRISES, AUTOMETER, CLASSIC INSTRUMENTS, DAKOTA DIGITAL, STEWART WARNER, and VDO just to name a few.

- Correct replacement headlight switch with internal circuit breaker
- Original Ford styled headlight switch connector
- Headlight enhancement relays allow for high-powered halogen headlights
- Separate relay controlled circuit for cars that have stock or aftermarket fog or driving lamps
- Complete wiring for all running lights, brake lights, directional lights, license lights and third brake lights
- Correct replacement ignition switch for use with original bezel and tumbler
- Correct original ignition switch connector
- Standard turn signal flasher and hazard flasher mounted on fuse panel; horn relay mounted on harness
- New ATO Fuse box fits the in center of the firewall away from header and A/C ducts and allows for easy fuse and circuit breaker accessibility
- All required hardware supplied
- Original switch connector bodies! (Exclusive to American Autowire)
- Separate optional under-dash light sockets along with original dome/interior light wiring
- New floor dimmer switch is provided and mounts in the stock location
- Steering column connectors will plug directly into most aftermarket steering columns. Directions and an adapter with terminals are included for running a stock Mustang steering column.
- Color schematics and easy to understand instructions included

Front lighting includes: extra long leads for special routing when custom under hood appearance is desired. All headlight, park light, fog light, and directional light leads are provided, as well as a switched trigger wire for electric fan relay (usually recommended with AC).

Engine wiring includes: feeds for coil, tach, water temperature, oil pressure, brake warning (with later updated extension if necessary), and electronic speedometer (if necessary). A heavy gauge alternator feed wire is provided for a typical 1 wire high-powered installation. This kit is NOT compatible with original style alternators or points distributors. It's wired for electronic ignition such as the Pertronix Ignitor.

Rear body wiring includes: backup light lead and ground wires, stop and tail light lead wires with proper focal length sockets, third brake light wire and the correct license plate lead connection for use with your stock tag lamp. Fuel tank sender wire and sending unit extension are also included.

Rear body harness assembly plugs into the main harness behind the left hand kick panel for easy accessibility and allows for original or custom routing.

*This 1965-1966 wiring harness cannot be used with factory (or original-style aftermarket) A/C systems, which interfere with the fuse block placement.
*American Autowire recommends this kit for MODIFIED original vehicles, not OEM restoration projects.
*Does NOT support ammeters.

Order a American Autowire Classic Update Kit Complete Wiring Harness for your 1965-1966 Mustang from CJ Pony Parts today!

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Mustang Applications

This product will fit the following Ford Mustang years:

Product Reviews

Write a review
American Autowire Complete Wiring Harness Classic Update Kit 1965-1966 is rated 3.7142857142857144 out of 5 by 7.
Rated 5 out of 5 by from Great update kit This kit has everything you need to update to a modern style harness. Has provisions for power windows and locks, third brake light and more. Directions provide fairly good instruction if you have a basic grasp of electrical circuits. I will say it was a bit intimidating at first but breaking it into sections really helps you not feel overwhelmed. Do make sure you either buy or rent the correct crimpers made for American Autowire. They make a huge difference in crimp quality and effort. It's not supposed to be a stock harness, if that is what you want, go with Alloy Metal Products.
Date published: 2015-01-18
Rated 2 out of 5 by from Not Painless... After replacing all the wires, my electrician noticed some parts were not designed for a Ford Mustang. The fuse box and other small parts were for a Chevrolet car. Electrician was able to adapt it, but for $700 I would expect better quality control... I shoudl have also checked each component more careful.
Date published: 2015-01-08
Rated 5 out of 5 by from Contains everything but the kitchen sink! Not for the faint of heart! This is my second wiring kit, the first was for a 67 mustang. My recommendation is to not tackle this alone. Another set of eyes and hands is very helpful. This kit includes almost everything you need to replace ALL the wiring in your mustang. (when pulling your old wiring, leave the wiper motor harness and switch!) It even includes replacement ignition and light switches. Take your time and if you have any questions, don't hesitate to call their support line! Oh, also HIGHLY recommend their specialty crimping tool, worth the extra $80 bucks!
Date published: 2016-06-09
Rated 5 out of 5 by from relays prewired and installed for most options Purchased for customer rebuild, I use american autowire for all my G M rebuilds. First time using for Ford, Very well made and fits well. No problems at all.
Date published: 2016-01-12
Rated 4 out of 5 by from Easy enough .. Lots of extra wire I got this to replace my faking harness while I hade the car apart ( replacing the cowl with the two peice cowl from Cj) it's going well now I havnt hade any issues putting it in ... The one thing I would warn is you have to find the correct wire crimpers the ones from aaw are not the only ones that will work .. These are GM style crimps also known as weatherpacks .. Search for those type of crimpers and you can find them a lot cheaper than AAW sells them.
Date published: 2015-01-31
Rated 4 out of 5 by from Easy install I'm several months from installing this harness. I watched a video of it being installed in the same year Mustang that was also adding the new gauges I have purchased. There were some does and don'ts but it was their not thoroughly reading the instructions that created the problems. It looks straight forward and easy (if you follow the instructions). I'm looking forward to the install.
Date published: 2015-10-07
Rated 1 out of 5 by from not good had to have a professional to install said this was the most painful wiring he has ever used told me to let others to know painless wiring harness is the way to good
Date published: 2015-09-14
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Product Questions

Hi there.  Can use this kit for a complete wiring replacement of my 66 Mustang coupé. The wiring is quite old and I want to replace it in complete on a winter job. Are all cables included as engine, dashboard, interior and lights??? Best regards Romain

Asked by: Wiero
The complete wiring schematics are shown but take note, this 1965-1966 wiring harness cannot be used with factory (or original-style aftermarket) A/C systems, which interfere with the fuse block placement. And American Autowire recommends this kit for MODIFIED original vehicles, not OEM restoration projects. Also, it does NOT support ammeters.
Answered by: CJPP Dave
Date published: 2016-06-23

Is there any slack in the fuse block that would allow me to move it a few inches over so I can still use the factory a/c?

Asked by: guitarman584
You should be able to move it slightly.
Answered by: rk cjpp
Date published: 2016-01-07

Will this kit work with the HW2811 and LED lights?

Asked by: Cj65
Yes, you're good!
Answered by: CJ Pony Parts
Date published: 2015-07-15

Do you have a kit to upgrade the ignitor to work with this harness?

Asked by: sparticus1701
No, this kit is designed to work with the Ignitor.
Answered by: CJ Pony Parts
Date published: 2015-06-22

i am restoring a 66 coupe l6 and was wondering to what engine upgrades i would need specifically(distributer,ignition coil)? and this has the full instrument cluster wiring?

Asked by: qman67
I would encourage you to read the description in full - it goes over the upgrades you would need to make. In short, the distributor and ignition coil are definitely a necessary upgrade. It includes wiring for the components on the instrument cluster.
Answered by: CJ Pony Parts
Date published: 2015-05-15

What's the cheapest 1 wire alternator I can get to work with this kit? And does this kit provide all the wiring for the car or is there more I'll need to get? Does it have radio wiring?

Asked by: trev7
Check out CJ part # ALT1. You should have all the wiring you need here.
Answered by: CJ Pony Parts
Date published: 2015-04-30

Hello how much the shipping towards France very fresh include costs and tax?

Asked by: dibant
To get a shipping quote, simply add everything you want from CJ's to your shopping cart and head on to checkout. In checkout, fill out your address info and scroll down to see shipping options with costs to your door.
Answered by: CJ Pony Parts
Date published: 2015-04-20

I am restoring a 1966 2 door coupe to factory original and I want to replace the wiring harness in the whole car what would you recommend for this project?

Asked by: Southguyon
This kit is for restomods, not factory restorations. You'd likely want something like this:
Answered by: CJ Pony Parts
Date published: 2015-03-16
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Product Video

American Autowire Complete Wiring Harness Classic Update Kit 1965-1966 Video Transcript
By Bill Tumas: When we ask our customers what the most intimidating part of working on their classic Mustang is, the answer we usually get is wiring. Original wiring is often frayed and brittle, plus you never know how many times in the past it's been cut or messed with. All it takes is one bad wire or one bad ground to take your Mustang off the road. If you're looking for originality, we carry a complete selection of replacement harnesses, but if you're looking for a modern harness flexible enough to be used with your custom build, check out the harnesses from American Autowire.

This kit is part of their classic update series for the '64 through '70 Mustangs. It allows you to replace your harness, while also upgrading to modern accessories. Let's take a closer look at what's included in the kit. The first thing you see when you open this box is going to be this stop page. This page isn't designed to intimidate you from the installation, it's more to tell you what the harness can and cannot do. The harness is designed to work with a modified car and so will not work with some stock components.

For example, it does require a one-wire alternator. All of the wiring for the one wire alternator is included. This will bypass your factory ammeter gauge, which is a safety concern when running a higher output alternator. You also have to have your tach modified to work with a negative feed. The original positive feed tachs will not work with aftermarket ignition systems and can also cause problems.

Instead of your typical installation manual, American Autowire provides eight pages of high quality color diagrams, as well as mounting templates for your kit. Once you open the box and all the bags up this is what you have in the kit. It can look a little intimidating at first. American Autowire does everything they can to make it that you can do it yourself. All your wires are labeled so not only do you have the color diagrams, each individual wire has a label on it stating where it goes.

Your fuse box is also completely labeled, as well as a bank of relays to keep all the relays in the same location and original style connectors whenever possible. The rear body harness is removable making that easier to install as well. The kit includes a new headlight switch, as well as a new dimmer switch. This kit here is specific to the '70. It allows you to relocate the wires since the '70 has the ignition in the column as opposed to on the dashboard.

This kit here is for your gauges. It allows you to wire up aftermarket or factory gauges, as well as make them removable. They also include all the relays and fuses, grommets, terminals, as well as a practice kit to make sure you're doing the terminals right before you put the harness in the car.

Taking a closer look at the fuse box you're going to see your flasher, your battery, your normal fuses. There's also additional fuses for fog lights, power windows, gauges, AC and heat, as well as accessories. That makes this very flexible for adding modifications to your car.

Installing a harness like this may not be for everyone. If you take your time and follow the instructions, this classic update harness from American Autowire is an excellent choice for your resto mod.