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Go Back   ClassicBroncos.com Forums > 66-77 Ford Bronco > Bronco FAQ > Electrical FAQ

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Rewire Options Rewire Options
Overview of the various rewire kits
There is no doubt that one of the most important components that you must check out on your EB is the wiring system. All of our EBs are over thirty years old and the wiring is frayed, brittle, and usually spliced in several places. You may be able to use the original wiring in your EB and the various vendors offer different parts of the original wiring harness if you only need to replace one section. One thing you will realize fast when dealing with your old harness is that the Ford engineers had a cruel sense of humor because the color codes of the wires vary from year to year. So, what is an easier alternative to all of this? There are several companies that offer complete kits to rewire our EBs, which I have listed alphabetically (not in preferential order).

Centech offers a complete rewire kit and this is considered one of the two easiest options to rewiring your EB. The kit comes with GM-styled sealed plugs and the connectors are Ford OEM so your lights will plug in with no problems. A new dimmer, wiper, and light switch are included in the kit and the wires are labeled. The wires in this kit are long enough so you can modify them if needed. The newer Centech harnesses include an adapter so your original ignition switch can be used and the fuse box has eleven fuses. You can find this harness for around $430.

EZ Wiring offers four different rewire kits but these are not EB specific and they will require more automotive electrical knowledge base than other kits. I have heard that these kits are used by many of the street rod guys with great success but there has not been a lot of feedback on our Board about these. These kits come with labeled wires and they can be modified to include any aftermarket equipment or gauges that you have added to your EB. The best thing about the kits are the prices, which range from $120-$165.

Painless Wiring offers a complete rewire kit for EBs. This is the second of the two easiest ways to rewire your EB. This kit includes wires that are labeled, 12 fuse block which is covered and for resistance to weather. The ignition, wiper, headlight, and dimmer switches also come with this kit. The connectors on the Painless kit are Ford OEM so your lights will plug directly into them. Long wires enable you to mount the fuse block where you would like under the dash. This harness is currently being offered for around $579 at different sites on the web.

Ron Francis offers a kit that can be used on EBs. This is a popular choice for those who have aftermarket accessories on their rides and want a custom wiring kit. This kit does rewire an automotive electrical background. Ron Francis kits offer 18 circuits on 16 fuses and the wires are long enough to be custom-fit to any application. Randy at Adventurous 4x4 offered a Mass Buy recently on a Ron Francis kit that he modified specifically for the EB but this kit is not listed on the Ron Francis website. This wiring kit will run you around $399.

Which wiring kit is the best? Well, that question will bring you more opinions than you ever wanted. I believe it is safe to say that all kits are adequate and the Centech and Painless are probably the easiest for novices. If you have an EB that has a lot of goodies then you probably want a kit like Ron Francis or EZ Wiring. Many people on the Board have been able to use all these kits with EFI. How long does a rewire job take? Usually about 20 hours..of course this depends on your ability and how many beverages you consume.

Whatever you do, make sure you check the wires in your EB and if you think you need new wires then you probably do, so replace them! I know there are other companies that offer wiring kits but these are the four that have received a vast amount of attention on classicbroncos. If you have any information that could be included in this FAQ please respond below.  
rednecktech on 10/28/08, 08:14 AM
Wiring problems

Does anyone have a wiring schematic, or do you know if they are included in haynes or chilton manuals?
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mudmagnet63 on 08/26/10, 12:48 AM

This is what I used comes laminated so grease wipes right off and color coded made trouble shooting a breeze. a must have for EB owners

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markperry on 08/26/10, 08:49 PM
I did the Centech.....very straight forward!
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LV73Bronco on 06/09/15, 04:22 AM
I recently added the American Autowire brand for early Broncos. It was very expensive at $1125.00. It had easy to follow directions but took a mechanic familiar with electrical 40 hours to complete. The biggest advantage was it had many extras left over to run any accessory you will ever need. I now have 4 USB ports, two lighters, 4 separate off-road lights, room to add my power inverter, and AC.
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brattwurzt on 08/20/15, 07:15 PM
WOW, the painless is up to $999 now.
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Delbert on 09/15/15, 10:58 PM
It looks like this post was started almost 10 years ago. The Centech link "cant be found". Does it really take 20 hours to rewire the EB now in 2015?
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OklahomaBroncoB on 10/16/15, 08:21 PM
I just spotted the American Autowire one on special on Wild Horses http://www.wildhorses4x4.com/product...ericanautowire thinking about grabbing one!
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Imhisnibbs on 08/30/16, 09:22 PM
Please bear with me this is my first post. I have a 72 Bronco and just bought the EZ Wiring harness. After dealing with the overwhelming look of it, I started to separate it out, decide where to install the fuse box and started to run the rear wires and front wires where I want them. I decided to hook up the rear harness first as I figure it is a relatively easy way to get my feet wet.
It makes no sense to wire to the old pigtails so I am going to get the pigtails and new grommets for the rear side & tailgate lights which is pretty straight forward and not too expensive.
However, the next thought that occurred to me is that I should also get the pigtails and new connections for the gauges front lights etc etc.
Does anybody who has gone through this process happen to have a list of all the pigtails connections, other terminal connectors I should consider buying as well as suggested upgrades so I can make a list of what I need and come up with a budget? I would rather get it all now rather than buy as I need to save time and be more organized?

Any help for this rather overwhelming project would be greatly appreciated

Thank you!
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Stiehl13 on 03/25/18, 12:33 PM
Ok guys, i need a little help. So i have ha parasidic draw commong from fues 8, which is the interior curtesy lights. So after snooping around i found that the door lights where cut, so i rewired them. Now there on but wont go off. So, i went to the doorjamb switch and found them cut, rewired them. No response with either button, door lights stay on. I moved back to the dome light, these where damaged, rewired them. Still, door ligjts stay on with no response with door jamb button. And no lights at dome or mirror lights.
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TMP on 06/22/19, 05:44 PM
I have an 89 Ford Bronco Eddie Bauer Edition, some mice chewed on some wires. There are wires going to the windshield washer motor not sure where the wires that have been chewed on go, can someone help please?!
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friar93 on 07/16/19, 04:01 PM
any updated opinions on the best wiring harness out there...particularly for someone that has never done it before?
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Darryl M on 02/17/21, 07:41 PM
Does anyone make a simple harness for a 6 cylinder with nothing but a radio and a heater? 1969
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