A Guide to Foxbody Wiring Harnesses

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2 ай бұрын

Matthew takes you through some of the nuances of the various years of wiring harness in EFI Foxbody Mustangs, and shows you how to identify which harness components you have. The focus is on the Computer and Body harnesses, which are the two most important harnesses in the car. Subjects include visual identification as well as electrical continuity identification, and which harnesses can be used together.
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@timo1642 2 ай бұрын

A wealth of knowledge. Thank you.

@tecmotiondyno 2 ай бұрын

You're welcome. I don't think this is a definitive guide, but there should be enough here to let you figure out what year of harnesses you are dealing with. I spent two weeks looking at the harness on Bad Decision, and I finally concluded that the EFI harness in the car was actually one that had been in an airbag Mustang, and then stripped down to a speed density type harness, except it still included the airbag connectors. I turfed for another harness, because who knows that all was done to the one that was in the car?

@eighty9fox 2 ай бұрын

This is great info to document, thank you! Very useful for my '89 V8 swap.

@tecmotiondyno 2 ай бұрын

You are welcome. A V8 swap on these cars can be a real minefield if you don’t know what you are doing with the wiring!

@Twolife 2 ай бұрын

I own an 82 Capri RS 5.0 since new... 42 yrs almost daily driver, being I'm retired for 5 years so just drive when I need too. Glad I don't have to mess with any computers!

@tecmotiondyno 2 ай бұрын

A carb setup is definitely simpler. If I had my guess based on everything I saw, I would guess that the bad decision project which is featured in this video had a carb at one point, maybe because they couldn’t sort the wiring mess out!

@Twolife 2 ай бұрын

@@tecmotiondyno Unfortunately I still have to smog it due to being in California. Even the cats have to be the same with # stamped on it for that model year.

@tecmotiondyno 2 ай бұрын

Brutal! Some states have a break for cars over 25 years old. Alberta has no emissions.

@kindercarcaredetailing4768 2 ай бұрын

Very informative and going to be absolutely useful when I start on my '92 ProjectGirl. Did go check and she has the mid 92-93 engine harness. Don't know if you remember but mentioned to you before that I bought her Dec 24 '22 and only driven her maybe 15 miles total, but got her out the other day and drove her couple miles down the road to the gas station and it hit me hard! I love this Fox and ha e got to get my butt in gear and get her fixed and reliable enough to daily drive. I've got more in New parts and all the diagnostic tools and just bought and ordered the Innova (I believe what it's called, the same one KASL did a video on) and it she be hear in a couple days or so. I just need to make time for her. Sorry so long but your videos, specially this one is and has got me excited along with about all the diagnostic books I've got, I should have her back to original shape and get rid of the racer wanna-be parts they've throwed together and on her so me and the wife can get out and enjoy cruising and taking on the trips from time to time we go on. Thank You Sir, always love and get alot out of your videos and wait for more that will help me with my ProjectGirl.

@tecmotiondyno 2 ай бұрын

I'm glad its helping you. I figured that a wiring harness video would not be a world beater view-wise, but it seems like an important tech resource that needs to be out there. A project like Bad Decision could certainly benefit from this type of video it it was in the hands of someone less experienced.

@notchit3542 Ай бұрын

OMG 😮Just by looking at this pile of spaghetti gives me a headache. You sir got good patience 👍

@tecmotiondyno Ай бұрын

Wiring is one of the most frustrating parts of these cars, and typically one if the most savaged parts of them.

@eliasflores4111 Ай бұрын

Hey man, just started working on my 87 lx project and I have the efi harness I’m trying to replace but I can’t find any removal videos on KZfaq, any tips on how to remove the harness and connect a new one back on? I have the dash removed just need to remove the harness.

@tecmotiondyno Ай бұрын

If you disconnect the pcm and a couple connectors down by the kick panel. You can pry the big firewall grommet out into the engine bay and just pull it out. You have to unplug it where it connects to the dash harness at the drivers firewall area, then just disconnect all the plugs on the engine and you can remove it. Watch for places it is clipped to the body and any connectors you missed. All of it just unplugs.

@eliasflores4111 Ай бұрын

@@tecmotiondyno appreciate that man, I’ll will give that a go.