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Old 07-16-2013, 08:59 PM   #1
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Red face Best materials for wrapping engine/injector wiring harness?

I think we've had a discussion or two on this before, but can't find the thread I was looking for. It may have taken place in someone's build thread so that makes it even harder to find.

Anywho, here's my question:

The engine wiring harness on my car is not in terrible shape, but not super awesome either. The plastic tube thingie is old and cracking, and the old electrical tape its all wrapped in is old and flaky.

I stripped it off, and re-did everything with new electrical tape from HF. Problem is, its cheap regular 'ol black electrical tape, and I really don't like it. After its been heat cycled it doesn't really stay on great, and you all know what I mean.

Anywho, I want to re-do it all with proper materials so its nice and snug/sturdy/and pretty/and clean. I'm not splicing or cutting or doing anything crazy. I'm simply cutting off the old electric tape and plastic tubing/cover stuff, and re-doing it.

What do you all suggest that won't cost an arm and a leg and will hold up great? Heat shrink? Sleves? Quality high-heat electric tape? Sleeves of some kind?

Throw your suggestions at me. I want both my injetor and engine harnesses to look like they did coming out of the factory in 2001. Pretty and neat.

Here's a picture of what I'm working with. Again, its not bad, but its not fantastic. I want fantastic

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Old 07-16-2013, 09:09 PM   #2
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It's pretty much impossible to get heat-shrink tube onto an existing harness. Ditto braided nylon sleeve.

My personal favorite is the same black corrugated tubing that the factory used. And I use black electrical tape on the ends. The trick is to secure the very end of the tape with a tiny black tie-wrap. This prevents it from un-raveling. (I have no idea what magic adhesive the factory used on their taped connections- I've never been able to properly duplicate them without using the tie wraps.)

Of course, my goal is for the under-hood environment to look unmodified, to the point where I have actually spritzed certain areas with WD-40 and then thrown dirt onto them in order to make the newly-modified sections look like the rest of the 23 year old wiring.
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Old 07-16-2013, 09:12 PM   #3
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Yeah I want my wiring to look factory. No funny business.

So you're saying this:



plus this:



is my only option?

Its actually what I am using now (on the engine harness that is). but I'm rocking cheap black HF electrical tape and maybe that's my problem.


If so, then follow up question:
I've heard that not all black electrical tapes are created equal. in fact some said the higher end ones are so much better its not even a contest.

Anyone know of really good stuff?
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Old 07-16-2013, 09:17 PM   #4
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what about self fusing silicone wrap?
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Old 07-16-2013, 09:18 PM   #5
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I'd use the split wire loom like the factory. On the ends, a better choice would be self-fusing silicone tape. It come in black. Use a lot of this in aerospace -- has good fire-resistant properties and it lasts. Something like this:

Sierra Self Fusing Silicone Rubber Tape 7ft Red 6456 | eBay
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Old 07-16-2013, 09:19 PM   #6
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You beat me to it.

If you already knew the answer, why did you ask? Are you a lawyer?
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Old 07-16-2013, 09:20 PM   #7
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I google search with the quickness
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Old 07-16-2013, 09:28 PM   #8
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I'm gonna noob-out for a second.

What gauge and type of wire is best used for making harness repairs/extensions?
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Old 07-16-2013, 09:48 PM   #9
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One useful technique to keep tape from unraveling is to overwrap the ends with another separate piece that is wrapped the opposite direction. I find that good quality electrical tape is worth the extra few cents per use.
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Old 07-16-2013, 09:50 PM   #10
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well Im giving this self fusing silicone tape stuff a try

sounds like its pretty cool, and looks like its available at my local home depot and ace hardware stores.
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Old 07-16-2013, 09:53 PM   #11
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Quote:
Originally Posted by 18psi View Post
what about self fusing silicone wrap?
I didn't read much after this, but please, please, please use this stuff.

I put it on my COPs harness, and it's incredible. Hasn't faded, cracked, changed colors, loosened, nothing. My only worry is it doesn't seem like it would provide much a heat barrier against the wires beneath it, but the packaging claims otherwise, and so far everything they claimed has turned out true. Just wrap it tight and make sure you don't leave any tails on it, as obviously it won't stick to anything but itself.
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Old 07-16-2013, 09:53 PM   #12
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Quote:
Originally Posted by 18psi View Post
So you're saying this:
(...)
plus this:
(...)
is my only option?
Nope. I'm saying that it's one option, and the one which I use on my own car.

For all I care, you can stitch together a string a distended cat anuses and sleeve the wiring with that.




Quote:
Originally Posted by 18psi View Post
what about self fusing silicone wrap?
Too rich for my blood, and not OEM.




Quote:
Originally Posted by FRT_Fun View Post
What gauge and type of wire is best used for making harness repairs/extensions?
Most of the wiring is in the neighborhood of 18-20 ga, with slightly heavier wire (~14-16ga) used in a few places like the injector wiring. None of it is all that massive by car-stereo standards.

As for type, hell, I dunno. I use cut-up pieces of other cars' wiring harnesses for most of my work. As in, go to the junkyard and tear the whole wiring harness out of the first late-model car you see. That will give you enough wire for several years' worth of random projects.
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Old 07-16-2013, 09:55 PM   #13
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Quote:
Originally Posted by FRT_Fun View Post
I'm gonna noob-out for a second.

What gauge and type of wire is best used for making harness repairs/extensions?
Wire Gauge and Current Limit Table
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Old 07-16-2013, 11:02 PM   #14
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Quote:
Originally Posted by curly View Post
I didn't read much after this, but please, please, please use this stuff.

I put it on my COPs harness, and it's incredible. Hasn't faded, cracked, changed colors, loosened, nothing. My only worry is it doesn't seem like it would provide much a heat barrier against the wires beneath it, but the packaging claims otherwise, and so far everything they claimed has turned out true. Just wrap it tight and make sure you don't leave any tails on it, as obviously it won't stick to anything but itself.
That's great. Definitely going this route then.
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Old 07-17-2013, 03:11 AM   #15
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I use the self-fusing stuff too and it's amazing. It bonds to itself and becomes one. You need scissors or a knife to ever get it apart, but does a great job in protecting the wires and keeping dirt out.
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Old 07-17-2013, 09:15 AM   #16
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posts a thread





ultimately is convinced to use the stuff Brain told him about two weeks ago.
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Old 07-17-2013, 09:18 AM   #17
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If you want nylon braid, they do make a split version:
Braided Cable Sleeving | Techflex® | Waytek, Inc.
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Old 07-17-2013, 01:15 PM   #18
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Quote:
Originally Posted by Braineack View Post
posts a thread





ultimately is convinced to use the stuff Brain told him about two weeks ago.
is this what you were talking about? lol I forgot.
now that I think about it, yeah I think you did tell me to try this stuff hehe
Quote:
Originally Posted by tpwalsh View Post
If you want nylon braid, they do make a split version:
http://www.waytekwire.com/products/1...Flexo-F6-Split
seems pretty nice, but I'm not sure if I need to go that far.

also on another note, faeflora contacted me via email and suggested this stuff:
High Ratio Heavy Duty Heat Shrink Tubing
http://www.rselectronics.com/SEO/Hea...nk_Tubing.aspx
http://www.electriduct.com/6-to-1-Hi...nk-Tubing.html

he said its really good, and from reading about it I do think its pretty neat. but kinda more for individual wires or 2-3 wires at a time. can't really imagine fitting the whole engine harness through it with its huge plugs and all.

although they do have a giant version of it, something like 2" in diameter, which would probably work. I love that its completely 1 piece.
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Old 07-18-2013, 02:16 PM   #19
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This is what we used in the BMW world. It's the OEM harness tape.

BMW New Wiring Harness Loom Repair Polyester Glass Mat Wrap Tape 24'7" 920760 | eBay

Actual BMW Part # 61 13 6 902 588
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Old 07-18-2013, 03:08 PM   #20
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Quote:
Originally Posted by z31maniac View Post
This is what we used in the BMW world. It's the OEM harness tape.

BMW New Wiring Harness Loom Repair Polyester Glass Mat Wrap Tape 24'7" 920760 | eBay

Actual BMW Part # 61 13 6 902 588
The velt-type tape is nice for under the dash, but not so much anywhere else where water/dirt come into the picture. That is MHO.
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