07 Cadillac Escalade ESV parts into a 99 GMC K1500 Suburban?

First off, sorry if this is the wrong thread, but it seemed the most appropriate.
Secondly, apologies for the long story, but it's a complicated issue.
I've got an 07 AWD Cadillac Escalade ESV that decided to wrap it's main wiring harness (engine to trans and 02 sensors) around the transaxle and tear itself apart. The part #15904556 is discontinued by GM and Ive been trying to find a replacement for months to no avail. No junkyard or private partout wants to verify the part # or ship to me. I cant keep drivng all over the place wasting my days off to only find the wrong part #. Yes, Ive scoured ebay and marketplace. Ive got $15k into the caddy between purchase price and upgrades and repairs. Im going to take a huge loss if I cant find this part.
That being said, in the event that I have to part it out and take the loss, what parts might be interchangeable with my 99 GMC K1500 Suburban? If I have to eat it with the Caddy I may as well upgrade the Burb with newer parts if possible. Obv I could swap the LS motor but I'm not trying to get into all that electrical BS and the wiring harness is fudged anyway. Can I swap the rear axle? Swap the rear disk brakes and replace my rear drums? What about tie rods, or AC blower motor? 02 sensors? ANYTHING. Literally anything that'll match up from the 07 Escalade ESV to the 99 Burban I want to take off for myself before I send the Caddy to the firey pits of financial loss.
Any and all advice and speculation is appreciated. I need to get the most out of the parts situation if I cant find the wiring harness.

How bad is the harness? Can you cut the connectors off and splice in new wire?

This site sells striped wire in hobbyist lengths.

Buy a bucket of these and get to splicing.
www.amazon.com/gp/product/B07L29DLGN/

Erik the Awful said:

How bad is the harness? Can you cut the connectors off and splice in new wire?

This site sells striped wire in hobbyist lengths.

18 gauge GXL automotive wire solid striped colors high temp oem | Harley Stripe Automotive Wire - 540 Colors Available - Custom Len

Red/white Brown/orange Yellow/black Green/red Orange/violet LTgreen/white Tan/black Red/yellow Brown/violet Yellow/white Green/blue Orange/white LTgreen/black Tan/green Red/blue Brown/red Yellow/green Green/orange Orange/black LTgreen/violet Tan/re

4rcustomswire.com

Buy a bucket of these and get to splicing.
www.amazon.com/gp/product/B07L29DLGN/

Click to expand...

Unfortunately I'm missing a few connectors as well, otherwise that's exactly what I would do.

Anynameyouwish said:

Any and all advice and speculation is appreciated. I need to get the most out of the parts situation if I cant find the wiring harness.

Click to expand...

Erik the Awful said:

How bad is the harness? Can you cut the connectors off and splice in new wire?

Click to expand...

Anynameyouwish said:

Unfortunately I'm missing a few connectors as well, otherwise that's exactly what I would do.

Click to expand...

Greetings Anynameyouwish,

Obviously I can't speak specifically to the '07 Esky Factory Service Manuals, but the overall trend has
been that the General's FSMs were/are improving as time goes on. What does this have to do
with your missing connectors? Let's use what we would do if this incident had happened to your '99 Suburban
and we needed to identify and replace a missing/damaged connector.

Step #1: Find the connector in the FSM. To illustrate the process, I'm going to pick a connector to the A/C compressor
as needing replacement. I have 2 wires running together, and they are color coded DK GRN/WHT and LT GREEN.
The connector was ripped off in the incident, but the wires look like they are long enough to reach the A/C
compressor. Using the 'CTRL F' (Find) function in the '99 FSM, I end up seeing this wiring diagram:




Aha. I write down the corresponding electrical circuit numbers (#762 & #66) and use those in the area of the Connector End View section,
and come up with this:



Alright, the trail is warming up. I have a match with the circuit numbers and both wire
color codes. And now what I really needed is showing -- the part number: 12162438

Step #2: So I start googling this part number, and the usual electronic parts web sites start
showing up. (Mouser, etc) The first handful of sites are tantalizing, for they are
showing me the correct part...but they are out of stock. Nevertheless, I find this
site at least gives me a clear picture of the connector I need:



OK, at least now I know I'm looking for a real thing, confirming that the '99 FSM data wasn't a typo. And since I have the unique part number,
I'll just continue my google search a bit longer:



Voila! This place has 5,619 of these connectors in stock.

Of course once you get the connector(s) in hand, there's going to be pinning, soldering,
weatherproof splicing, verifying continuity post repair, routing the new harness so that it
doesn't get pinched or burnt, etc.

But don't let a handful of missing connectors force your hand and cause you to flush a
$15K investment down the tubes. Erik & I are seeing dollars worth of wire & connectors (plus
time & effort) needed to repair your existing harness. On the other hand, opportunistic junkyard
operators are going to price a low-volume wiring harness based on fear. (ie: no replacement harness
= 'impossible' to fix, so they will charge $$$+ and justify it based upon the value of your vehicle.)

If there ever was a place where it made financial sense to buy a used set of '07 Esky Factory Service
Manuals, some precision electrical wiring tools, watch a few YouTube videos on wiring/soldering/splicing/etc
...and start working through your existing harness, one circuit at a time, I think this is the scenario.

To summarize, by working methodically through the broken areas of the harness, we can start
with just the colors of the individual wires, end up with part numbers for the missing/damaged
connectors, find the bits across the internet, and not take no for an answer. :0)

Hope this makes sense.

Best of luck with the hunt!