Check out the various catalogs (NPD, Dallas, Virginia Mustangs, etc) for wiring harnasses. There are some for just the engine compartment.
Good luck.
Stan

 

I think I have a repop for a '66 that's really really nice. If it's the right one I'll let it go dirt cheap!

 

Hello Greg:

The two main engine compartment wiring harnesses have
'bulkhead' connectors at the firewall. You can buy repro
harnesses with the correct wire lengths, connectors and even
wire colors. I bought my new harnesses from Virginia Classic
Mustang and the quality was excellent. I hope that other Mustang parts supplies carry the same high quality harnesses. For '66, you're looking for the 'Firewall to Headlamp' harness (front end lighting, charging system, starter relay connections, horns) and the 'Firewall to Engine
Gauge Feed' harness (oil & coolant sending units, heater fan, ignition coil primary, etc.) Also, there is a small 'Alternator' Harness which connects directly to the alternator terminals.
This harness then connects to the first harness mentioned.

Remember to clean both the male & female connections on the 're-used' firewall bulkhead connectors. A little oxidation will increase resistance in the circuits and cause problem.

Good Luck,

Paul

 

Amazing timing on your question Greg. I'm looking for those exact two harnesses for my 66 as well. Last night I sent an E-mail to Matt at Ponderosa Mustang to see if he had them and how much $$$. I'll let you know what I find out as soon as he responds. If you find a good deal, please let me know via PM. Thanks

 

They come as 4 different kits. One is for the engine and one for the alternator. It sounds like you do not need the other 2 kits. I re wired my 65 convertible a couple of years ago. At that point I bought from Mustangs Unlimited ( I think they are in Delaware, sorry can't remember). I was impressed with quality. However, they are not cheap. good luck. doug

 

Yes, there are 2 wiring harness from the firwall forward and is a simple plug and play. An alternitive is Painless Wiring. There are suppose to be comming out with a new 65/66 kit.

 

I highly recommend replacing the alternator harness, the gauge engine harness, and the headlight harness under the hood. The repro harnesses are excellent quality, and you can replace them all in about an hour. I did mine by removing one connector at a time, so I couldn't go wrong!

The most difficult is the headlight harness, which actually routes below the radiator. You'll need to tie a string to the existing one so you can pull the new one through.

 

Sounds good....which wire set is it? Engine, headlight or alternator? Also, does it plug to the firewall or does it go all the way back to the dash?

Just currious, Greg.

 

Think it's the headlight one, not sure. I'll check today.

 

I've got all the under hood wiring, headlights, alternator, & ignition. All were used 6 months on a car that was totaled. They were bought new. $30 plus shipping ok?

 

Greg (white66coupe1), sounds like a great deal. This was your post, so these harnesses are all yours if you want them. But ... if you choose not to please let me know. I'd love them! Thanks

 

Sounds good (well.....except for the car being totaled, my sympathies to the car).

How do you want to do this? What is your mailing address? I will send you a money order. Also, do you have a separate email address, maybe we could take this off-line?

Thanks, Greg.

 

I think I'm gonna go ahead and get the wires, I really need them.

Greg.

 

I bought the car that way so I didn't feel the loss. E-mail me at qtrmiler@hotmail.com We'll get this done so you can get yours done /forums/images/icons/smile.gif

 

Hello, From New Zealand ,I have a 66 gt Mustang hardtop with original fog lamps and rally pac and centre console etc. I want to get an original factory looking wiring harness from the firewall forward and fire wall backwards under the dash etc. Can any one please tell me where I can buy these components from. The Painless brand ones I have seen, has a different type plug going through firewall . I want original looking one . I just want car to look original but with a new harness for a GT. Any help would be appreciated. Thank you . Regards Gary Stables

 

Contact

@Midlife

Welcome to Midlife Harness Restorations

Z

 

I would either have your old harness rebuilt by Midlife as zray posted or buy a one made by Alloy Metal Products. Alloy Metal Products is just like OEM so it's plug and play and Midlife makes your old harness look new.

 

Aside from having @Midlife restore your harness, if you contact him he might have your harness’s in stock and ready to ship. Being in New Zealand that might help reduce your downtime..

Z

 

You can replace all wiring under the hood by unplugging at the firewall