Tom's new EFI harness

[72bronc0]

I am ready to buy a harness for my EFI swap. Has anyone used Tom's Bronco Parts harness? They are running a special for $525 and it's in stock.

I just talked to them and they are not made by RJM anymore. Same with BC's harness.

Has anyone used this harness from Tom's new vendor? They assured me the quality is the same with all Ford connectors, etc. Thanks for any input.

[Lars]

Re: Tom's new EFI harness

That looks really nice. I've never messed with an RJM harness, but I've wired a few Broncos using the old (late 90's/early 2000's) Ford Racing harnesses as well as used harnesses, and I've built up a couple of frankenharnesses from a mix of new and used. It's not for the impatient or anyone who lacks attention to detail. You have to be meticulous and carefully QC your work if you don't want to do a lot of troubleshooting later, especially if you start customizing stuff.

If I was wiring a Bronco for myself now, I'd fork out the money. Major timesaver, if you can afford it.

[garberz]

Re: Tom's new EFI harness

I had heard that Ryan's harness is now being made by Ron Francis. Maybe that's what Tom's is selling.

[old69bronco]

Re: Tom's new EFI harness

I just got my harness today and it's just like it says lay it on the motor and plug it in

[brocbronc]

Re: Tom's new EFI harness

I had heard that Ryan's harness is now being made by Ron Francis. Maybe that's what Tom's is selling.

i have a ron francis harness and 3x rjm harnesses. they are not the same. the ron francis harness has a separate harness plug that allows you to pull the motor without removing the entire harness.ugs from the rest of the harness. Its very similar to the stock mustang harness that separates the injector and intake pl The RJM harness is a one piece harness.

[BigHarvey56]

Re: Tom's new EFI harness

i have a ron francis harness and 3x rjm harnesses. they are not the same. the ron francis harness has a separate harness plug that allows you to pull the motor without removing the entire harness.ugs from the rest of the harness. Its very similar to the stock mustang harness that separates the injector and intake pl The RJM harness is a one piece harness.

Harness that unplugs so u can pull the motor like stock? Awesome

[brocbronc]

Re: Tom's new EFI harness

Harness that unplugs so u can pull the motor like stock? Awesome

I assume you are being polite. It doesnt seem like you are offering any useful information.

I have the Ron Francis and RJM Harnesses in front of me.

The RJM harness is a one piece harness with a disconnect plug to separate the oxygen sensor harness. It also has a built in EGR eliminator.

The Ron Francis harness that I have has three parts to the harness. The main engine harness, the injector harness, and the oxygen sensor harness. THis is similar to the stock 89-93 mustang Mass Air harness. It has the same two plugs that allows for separating the injector harness from the rest of the main harness. This means you can leave the upper intake on the motor when removing.

The Ron Morris also has EGR connectors.

I used an RJM in one of my Broncos and it works great. Ive never pulled the motor since install 5 years ago.

Here are some pictures... The first is the Ron Morris harness with sections detached. The second pic is the RJM harness. THe last pic is both harnesses for comparison.

I hope this info helps someone.

[brocbronc]

Re: Tom's new EFI harness

The Toms efi harness looks just like the RJM harnesses that I have here. I just bought mine during the Thanksgiving 2011 sale. RJM harness is really nice.

[72bronc0]

Re: Tom's new EFI harness

Thanks for the pictures Brocbronc. Like you said, it would probably be awhile before I had to pull the motor again. Then again I'll probably have to just as soon as I say that.

I'd like to buy from Tom's, the only hang up I have is the lack of the egr eliminator.

To complicate things a little, Summit sells the Ron Francis "detail zone" harnesses with the egr eliminator installed. They claim to use RJM technology and the spout connector looks exactly like Ryan's. It's hard to tell from the picture but I cannot see any large disconnect plugs. The picture may be wrong though if you say the Ron Francis harness has them.

The unwrapped harness is 475 while the bronco specific harness is about 550. Kind of leaning towards the un-wrapped version since I might be changing to a few explorer plugs anyway.

Here's the links:

http://www.summitracing.com/parts/RFW-COBRA75/

http://www.summitracing.com/parts/RFW-TDZ75/

[BigHarvey56]

Re: Tom's new EFI harness

I assume you are being polite. It doesnt seem like you are offering any useful information.

I have the Ron Francis and RJM Harnesses in front of me.

The RJM harness is a one piece harness with a disconnect plug to separate the oxygen sensor harness. It also has a built in EGR eliminator.

The Ron Francis harness that I have has three parts to the harness. The main engine harness, the injector harness, and the oxygen sensor harness. THis is similar to the stock 89-93 mustang Mass Air harness. It has the same two plugs that allows for separating the injector harness from the rest of the main harness. This means you can leave the upper intake on the motor when removing.

The Ron Morris also has EGR connectors.

I used an RJM in one of my Broncos and it works great. Ive never pulled the motor since install 5 years ago.

Here are some pictures... The first is the Ron Morris harness with sections detached. The second pic is the RJM harness. THe last pic is both harnesses for comparison.

I hope this info helps someone.

i too have an RJM harness and once i install my motor and harness i dont plan on pulling it all apart, but we all know how things go. i just dont want to unplug everything once it is all installed. im thinking about putting in a plug so i can just unplug and leave most of the harness on the motor and not have wires laying everywhere. and i hope i didn't offened you in any way.

[Lars]

Re: Tom's new EFI harness

Just remember y'all, that a connector = a failure mode. The "salt n' pepper" connectors on the factory Mustang harness were notorious for causing electrical gremlins as cars aged and the connector pins corroded. On corral.net there were plenty of stories about guys eliminating them and permanently joining the harnesses back when I was first doing my EFI swap around 11 years ago. Corrosion is related to age, not miles driven. When I built my latest harness I got those gone. If you pull the engine a few times a year then a disconnect might be nice, but otherwise the risk of electrical problems isn't worth it IMHO.