High temp wire loom - what I learned

Archbid · Feb 22, 2019

I have a lot of plastic decay, so I wanted to replace the wire loom around parts of the harness, notably around the thermostat and for the reverse light sensor over the transmission. I was shocked at how deteriorated the existing plastic was, so I did a bit of research and figured out a few things.

First, there is standard plastic wire loom:

This is not particularly heat-tolerant and will decay.

Source:
https://www.amazon.com/Split-Tubing.../dp/B00KW9RHYG/ref=sr_1_5?ie=UTF8&qid=1550855627&sr=8-5&keywords=1/4+split+loom

Second, there is high-temp wire loom. It has a grey strip along its length to indicate that it is made of nylon and can handle higher temperatures:

Source: https://www.amazon.com/gp/product/B00MX85DFE/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

The issue with the high-temp loom is that it is very stiff, making it extremely hard to actually split to run your wire through. The solution is a wire loom tool.
https://www.grainger.com/product/DROSSBACH-1-4-to-7-16-Orange-White-Split-25D279

I was impatient, so I modded one off of a model I found on a 3d site, so if you have a 3d printer, here is the STL file to print a tool for free:

https://www.dropbox.com/s/bko4497uxsektb0/Wire_Loom_6.gcode?dl=0

I hope this is useful!

LeverThis · Feb 22, 2019

I have some wiring under the hood that needs new loom, so thanks for the info on the nylon split loom & the tool. I was confused a bit from the picture as to how the tool works, but turns out the tool has an opening on the back of both white & orange pieces for the wiring to be fed through. You rotate the openings together to insert/remove the wiring.

Here is a short video I found to demonstrate:
https://youtu.be/qhKVb6GrbOs

Archbid · Feb 22, 2019

I tried to use 1/4" nylon split loom without it and it was a joke. My 3d-print version worked like a charm, however! If you are in a bind LMK and I will mail you one.

LeverThis · Feb 23, 2019

Thanks, archbid. Grainger is an easy pick up at the store for me, and I've already ordered the tool you linked from them. I appreciate the offer though.

Archbid · Feb 7, 2020

I recently did an engine swap and replaced five sections of wire loom where it had disintegrated. There are three sizes of loom on the engine harness, btw.

If you want to make it clean, open the little plastic connectors and secure the loom inside each. Opening the main harness box is a pain, but you can, and it will secure the loom.

Hani · Sep 27, 2020

Which 3 sizes did you end up using that matched the existing ones form the factory Archbid? Thanks

Archbid · Sep 27, 2020

HIGH TEMP SPLIT LOOM NYLON 1/4"ID 50FT	769901	1
HIGH TEMP SPLIT LOOM NYLON 3/8"ID 50FT	769902	1
HIGH TEMP SPLIT LOOM NYLON 1/2"ID 50FT	769903	1

Archbid · Sep 28, 2020

Those part numbers are from elecdirect

High temp wire loom - what I learned

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