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Wiring Harness Options

Rombist

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Nov 23, 2025
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I was looking for some insight into which company makes a complete harness for 1975 Bronco that has a 1990 HO 5.0 Saleen EFI motor option. A lot of the harness is original to 1975 except with the 1990 mustang motor harness that I grafted to Bronco. Wanted to start planning changing it out as it will be done with paint in a month or so. It has the original C6 trans and was thinking of doing LED lights also. Thanks
 

jeffncs

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May 4, 2004
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Raleigh, NC
Haven’t used the NE harness. I’ve installed 2 each of Centech and painless. Centech is no longer…. Even such, I thought the painless kit was easier than the Centech harness. Both work well. My $.02….. worth what ya paid.
 

Torkman66

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Apr 3, 2022
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New Braunfels, Tx
I did the Painless. Great kit. Everything well marked, wires, colors, fantastic instructions, and well made. Worth the extra cost to get the full terminated kit not the general kit. You will need an additional efi harness but call them to discuss that part. I’ve installed three now and would not look at anything else. Very complete.
 

904Bronco

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Sep 28, 2004
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San Martin, CA
Centech is gone as stated above...
Haven't done a Painless, from what others have said it is a Good harness that was redone a number of years ago with input from the members here on the site.
Done a number of American auto wire harnesses, in a few Broncos, 66 Chevelle, universal kit in an FJ40 Landcruiser, etc...
Paul aka "Dirt Donk" has been suggesting that I do a North East harness next time...

I have done a couple of the RF Mustang EFI harnesses and co-mingled them with Centech/AAW/Factory harnesses. (That harness is based on Ryan's design, a former member of this Site, that he sold here quite a few years ago, which I believe he then sold to RF)

Then there is the Explorer harness, but that doesn't meet your needs as you stated.

The prices, man they continue to go up... Not much that we, or the Vendors, have control over...
 

DirtDonk

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I was looking for some insight into which company makes a complete harness for 1975 Bronco that has a 1990 HO 5.0 Saleen EFI motor option.
As the others have alluded to, and you have sort of found already, nobody makes a complete harness for your set up.
Meaning that, the engine harness is standalone and has nothing to do with the main chassis harness, other than being interconnected at a few key points.
Other than that, you are talking about two separate harnesses.

At this point, nobody I know of makes a single harness that encompasses the vehicle and the engine.
It really wouldn’t make financial sense, given how many different engine management system systems are currently being installed in Broncos.

The only answer to that is a full custom.

Painless is still the only one that uses factory colors to my knowledge.
Northeast Classic is a Centech on steroids. Very nice and very much “pre-wired” if you will. But that doesn’t mean practically installed! :)
Along with American Autowire, those are probably all the most complete harnesses you can get, for a Bronco.
Painless and American Autowire probably have the most extra circuits. That can be an advantage in some installations I suppose, but it’s not completely necessary for a Ford EFI setup since the fuel injection system has very few required interconnections with the chassis harness.

Still waiting for 904Bronco to bring in a project that could use the NEC harness in question. Nod, nod, wink, wink, knowwhatimean?😉😁
That would give him a full compliment of “which harness do I prefer most on which vehicle on which day of the week except Sunday” and give us something else to talk about.
No pressure though…😁
 

Soren

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Joined
Aug 27, 2026
Messages
22
I hope I'm not breaking any forum rules with this reply, but if you need a new EFI harness I do happen to have one.

I bought the harness from RJM Technologies 15ish years ago to install the Mustang EFI on my 5.8, but never got time to do the project. Now I've decided to go with the Explorer EFI so the mustang harness is available... Feel free to PM me if you're interested Rombist.
 
OP
OP
Rombist

Rombist

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Nov 23, 2025
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Thanks for the offer Soren but thats what I used before and was wanting to clean it up. Was leaning towards the RF for engine and trying to decide between painless and AWW. Was going to look into full terminated kit by Painless as mentioned earlier by Torkman66
 

DirtDonk

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Nov 3, 2003
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The Ron Francis main harness is a very cool set up. The only issue anyone ever seems to have is the physical size and mounting possibilities of the fuse panel itself.
But once you get past that single stumbling block, the function is excellent.

The AAW, while Bronco specific, is not quite as “Bronco-centric“ as the Painless and Northeast.

Can’t go wrong with any of them actually.
 

DirtDonk

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That’s a great suggestion! Other than the possible longer wait time, it would be just what you want and/or need.
 

ba123

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Oct 29, 2022
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2,757
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CA
I have both the Bronco and the Mustang EFI Ron Francis kits and then a Megasquirt additional harness on top of that, and running coil near plug with a crank trigger and a cam sync so a lot of wiring. To add to that, I am a fan of clean looking and not a bunch of unnecessary stuff floating around.

I opted for the RF harness because every system comes in a separate bag with a connector and a long stretch of wire so you can wire things any way you want.

It's the only system that would allow me to do things my way.

As mentioned, the fuse panels are HUGE so that is a challenge. I had kick panel compartment boxes made and have one panel in each side.
 

bronco italiano

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Feb 1, 2004
Messages
2,593
I have both the Bronco and the Mustang EFI Ron Francis kits and then a Megasquirt additional harness on top of that, and running coil near plug with a crank trigger and a cam sync so a lot of wiring. To add to that, I am a fan of clean looking and not a bunch of unnecessary stuff floating around.

I opted for the RF harness because every system comes in a separate bag with a connector and a long stretch of wire so you can wire things any way you want.

It's the only system that would allow me to do things my way.

As mentioned, the fuse panels are HUGE so that is a challenge. I had kick panel compartment boxes made and have one panel in each side.
And note: ba123 is TREMENDOUSLY tech savvy. That RF panel is intimidating to me
 
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