How to re-loom your ECU/engine/transmission wiring harnesses

[strutaeng]

Alright, my first real thread

So the wiring harness loom was missing in a lot of places in my 2006 suburban 2500 LQ4 2wd. I bought the truck like this and the PO was kinda a car guy, pretty clean so I don't know what happened. I guess age is also part of it. Anyways, I'd been putting it off until last weekend.

It's kinda tedious, but if you have a few days just bored, it's very doable and will probably cost you about $100 in various loom electrical tape, heat tape, etc. You can inspect the wires and repair/replace damaged wire or connectors. I think the grounds at the rear of your engine is probably the hardest part.

Clean/wash your engine while you are there.

 

[strutaeng]

A few more pics.

I had bought a connector pigtail for the transmission speed sensor. The electrical insulation was missing and it touched and I got a code last year when the transmission was removed to replace a leaking rear main seal. Unfortunately I couldn't find the replacement in my garage, so I added some electrical liquid tape. Same situation for my cam position sensor. Hopefully this works.

I started the truck and everything seems good.

 

[strutaeng]

Most loom is 1/4, 3/8, 1/2, 3/4 and 1" which is found at most auto parts stores.

The big trunk seemed to be 1 1/4 and that's what I ordered from Amazon, but mine was a bit undersized, so I ordered 1 1/2 from Napa and that seemed too big.

The heat tape is aluminum from the home center.

 

[swathdiver]

Just did this myself. Used two bags of Taylor Convoluted Tubing Assortment 38000 and one American Terminal - Convoluted Tubing - Wire Loom - 1.5" x 10'. To secure the ends
Red Wolf - Wiring Harness Tape (3/4" x 50 FT) GJ0002-0008 was used. Have enough left over to do the other truck.

Sure looks nice all done eh?