Wiring order…

[PatioDaddio78]

I’m looking for some guidance on how I should tackle the wiring for my bronco restoration. I picked up the painless wiring kit, a Proflo4 for EFI and the Quick4 controller for my 4R70W transmission.

Any advice on how I should get started, I am Overwhelmed at the numerous bundles. From the videos I’ve watched I know this is going to be a tedious task and I just want to take it slow and do it right the first time. I don’t have the body on yet and want to see if there’s anything I should do, connection wise, before I put the body back onto the frame.

As always, thank you for your guidance!

Mark

1973 - Father and Son Project

Hello Classic Broncos! My son Levi and I have found a project for his senior year in high school. We are both novices at this and will be frequent visitors to this forum for help and guidance. We are starting our deep dive into YouTube university to get the creative juices flowing and grow our...

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[pcf_mark]

Install the core Bronco harness first. Test that all out, get all your lights and accessories working, engine cranking, signal at coil etc. If you have a carb and distributor get the engine running too.
The solve your EFI fuel side and set up your EFI and get your engine running.
Then wire the transmission which is going to be looking to your EFI for throttle position and map sensor.

Take your time, use wire ties to secure your work, work as neat as you can. If in doubt just spread it out on the floor of the truck to get things in place and hooked up. You can always make things neater once your confidence is good you have it working. Use fuses for everything, do not tighten the clamp on the battery so you can yank it off if needed.

Keep a fire extinguisher around just in case. Not mkaing light if you don't need so what but if you do it could save your project.

 

[Brush Hog]

It is not as bad as it looks. Did one about 2 years ago for first time. Take old one out without cutting it as much as possible. Makes comparing to new harness much easier. If you do cut off a switch or sensor leave lots of wire. Lay out the new harness on ground next to bronco if possible to get idea of how it goes. Work slow triple check everything to the instructions. It won’t be bad.

 

[JeepGuy]

I went through this last year with a new painless. My plan was as follows:

Dash was completely removed from the Bronco.
Installed all gauges and switches.
Laid the harness out behind it and pretty much just followed the books order.
-Glove Box
-Fuse panel install
-Then gauges and lights across the dash.

Before moving it into the Bronco I separated the Drivers Side, Engine, and Passenger Side.

*I did not permanently zip tie anything until it was completely installed. Use the wire ties that come with the kit as temporary when needed.

From there, it's not too hard to get everything where it needs to go. On the passenger side you will have to remove or terminate a few wire related to your ignition and potentially alternator depending on what you are running. This has been done multiple times on the boards and if you take your time you can usually find the answer. I always tried to locate it, then asked for confirmation on here if it wasn't clear enough.

In your case with the ProFlo, you will have to figure out where all the wire is going (inside cab or engine compartment) and how you want to route it all. That is something I will be doing in the future.

I will say, I'm far far far from an electrical guy. I took my time and just followed the instructions and it all turned out great. Do not be surprised if some of the switches or gauges are bad right out of the box. That is just an unfortunate part of today's deal.

 

[73azbronco]

leave a few inches extra wire...

 

[1969]

Return or sell your painless and order the new harness from @delconick that will simplify it a lot.

 

[SeaVee]

At the same place right now, and one of my buddies just completed his rewire . He lent me this thing he made to work on the dash easier, sure makes it easier

 

[JeepGuy]

@PatioDaddio78 Not a major issue, but something that caused me to pull and run wire a couple times for the rear section. It is simple enough, not too many there, but what I messed up on initially was their relation to the other lines that go back from the firewall (Speedo, E-Brake, Fuel, Brakes). It is simple enough to plan out, but of course during my install I had them twisted and up and over each other. Nothing complicated, just a thought when laying it out.

At this point I think you still have your body separated, so this would be a real good time to make sure you rear brake lines, fuel line, speedo cable, and e-brake cable are run and secured to the frame how you want them before putting the body on. That will eliminate the issue I had while installing the wiring.

 

[Brush Hog]

Get a really good pair of crimpers and a really good pair of wire strippers. You will use them a lot. Along with a heat gun.

 

[gnpenning]

@PatioDaddio78 Not a major issue, but something that caused me to pull and run wire a couple times for the rear section. It is simple enough, not too many there, but what I messed up on initially was their relation to the other lines that go back from the firewall (Speedo, E-Brake, Fuel, Brakes). It is simple enough to plan out, but of course during my install I had them twisted and up and over each other. Nothing complicated, just a thought when laying it out.

At this point I think you still have your body separated, so this would be a real good time to make sure you rear brake lines, fuel line, speedo cable, and e-brake cable are run and secured to the frame how you want them before putting the body on. That will eliminate the issue I had while installing the wiring.

This is similar to building a house. Get all of your fixed place items done first. Wiring is flexible and can be adjusted to the location. Hard items require a lot more work to change location. Great advice.

 

[Glass Pony]

Like JeepGuy said, after you get all the gauges and wiring in the dash (removed) I was able to get one bolt in both "L" brackets at the bottom and lean it out against the transfer case shifter to route the wiring through the firewall. Hope this helps.

 

[JeepGuy]

Wow, that is a great

Like JeepGuy said, after you get all the gauges and wiring in the dash (removed) I was able to get one bolt in both "L" brackets at the bottom and lean it out against the transfer case shifter to route the wiring through the firewall. Hope this helps. View attachment 942123

That is a great idea using parts you already have in place instead of having to make some kind of jig up. My only concern on a freshly painted bronco would be the areas the side hinges are at and where the actually dash lines up. Looks like you had that squared away.

 

[Shimmy]

is there a diy for leaning it out? lazy me, i haven't searched yet but i see a wiring swap in the future