Replacing Main Engine Wiring Harness

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Sep 12, 2019 | 04:42 AM

AUM

Thread Starter

Mountain Pass

Joined: Mar 2019

Posts: 148

Likes: 1

Replacing Main Engine Wiring Harness

Hi,

Im in for a new harness and am considering doing the job myself. Not a formed mechanic but do have a mechanical inclination all though electrical has never been my strong point.

How hard of a job is it? How many hours should it take considering the learning curve?

Thanks for any advice.

Sep 12, 2019 | 07:50 AM

AubieTN

Tuned

Joined: Jun 2007

Posts: 431

Likes: 66

I did mine some years ago. It’s pricey, too. Mine came from Mexico if my memory is correct. You would need to take the new harness and work with it in a warm/hot atmosphere and start forming the various pigtails in the same orientation as the old harness. The new harness will be very stiff. My buddy did his after I did and found a much better price, so shop around. Some of these internet Ford dealerships can offer good pricing, so don’t think they will always be high.
A new harness may resolve some issues you might be experiencing.

Sep 12, 2019 | 08:06 AM

AUM

Thread Starter

Mountain Pass

Joined: Mar 2019

Posts: 148

Likes: 1

Thanks. Already purchased from RiffRaff.

Do you have a background in mechanics? How long it take you?

Sep 12, 2019 | 01:18 PM

AubieTN

Tuned

Joined: Jun 2007

Posts: 431

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It has been a long time and I can be **** sometimes, so I would say it’s easily done over a weekend with numerous breaks depending on the which football games are on the tube.
I don’t recall the harness having duplicate connectors such that you would plug one into the incorrect sensor. The wiring along with the connector pretty much determines where it goes. As I mentioned earlier you might have to wrestle with some legs of the harness to properly route it.

Sep 12, 2019 | 03:00 PM

AUM

Thread Starter

Mountain Pass

Joined: Mar 2019

Posts: 148

Likes: 1

Thanks. Did you recall removing transmission cooler, radiator, ac compressor?

Sep 12, 2019 | 03:06 PM

beef tits

Laughing Gas

Joined: Mar 2017

Posts: 833

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I don't think you have to remove the raditor, our harness splits right at the side of the motor. I almost bought a brand new one but ended up patching all my old ****ty wires. You will have to take apart the top of the engine and have to route down over the front of it too - helps to have tiny hands. Pay close attention to where the wires are routed - get them right back where they belong.

Sep 12, 2019 | 03:34 PM

Walleye Hunter

Hotshot

Joined: Mar 2014

Posts: 10,750

Likes: 1,065

From: Douglassville, PA

I don't think you should need to remove any major components. Maybe the CAC tubes and/or the turbo spider will make things easier but it should be pretty easy and straight forward, just a little tedious. I never replaced one but I have pulled a couple of engines and I pulled the harnesses off before pulling the engine. There are two connectors that are the same, the one for the EBPV and the one for the IPR, their positions being what they are you would be hard pressed to connect them wrong, otherwise they are all different and you can't go wrong (except for the UVCH's but that shouldn't be a problem). At its thickest part the harness is kind of thick and stiff and you might need to pull a bracket of some sort to get it woven into place.