how to properly wire along main harness?
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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132985
Printed Date: May 15, 2025 at 1:04 PM
Topic: how to properly wire along main harness?
Posted By: bikemaniac
Subject: how to properly wire along main harness?
Date Posted: December 15, 2012 at 3:18 PM
Hi,
I need to install an automatic daylight relay in my car. From looking into many engine compartments the eye always catches wires everywhere from DIYs. And it looks messy although it works. Many different colors and wires hanging everywhere. What is the best way to properly run new wires along an existing wire harness in such a way that the job looks tidy and professionally made? Is it a matter of choosing black wires only (so they will match the main harness), should you use cable ties, should you use Scotch 33 every 10 inches, should you fully wrap the entire wire for the entire stretch? Any tips? Photos would be nice :-)
PS: I have realized that I will solder the wires to the existing harness as this is the preferred method discussed in this forum.
Lucas
Replies:
Posted By: kreg357
Date Posted: December 15, 2012 at 10:04 PM
How you thought of using Split Wire Loom? It comes in different diameters and colors. You can use electric tape to seal the ends and every so many inches along it's travel and use tape or tie wraps ( zip ties ) to secure it to other harnesses, etc.
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Soldering is fun!
Posted By: KPierson
Date Posted: December 16, 2012 at 12:56 AM
Split loom is the way to go if the OEM used split loom (and maybe even if they didn't). Exposed wires with no protection in the engine bay is not a good thing.
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Kevin Pierson
Posted By: bikemaniac
Date Posted: December 16, 2012 at 1:46 AM
Hi,
I didn't think of the split wire loom. The harness already has the loom in several places. So do you suggest:
1. Removing the existing loom (if present), fitting the extra wire(s) and putting the loom back on?
2. Fitting the new wire(s) and putting a new extra loom on top of the existing loom?
Lucas
Posted By: KPierson
Date Posted: December 16, 2012 at 2:04 AM
Run all new loom and keep it fastened up tight like the OEM loom. After 3 months you won't be able to tell what is factory and what is added. The 3 months gives the new loom time to get dirty like the OEM loom!
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Kevin Pierson
Posted By: howie ll
Date Posted: December 16, 2012 at 5:39 AM
X 3 with Kregg and KP, cheapest source? Wreckers yard!
Or one of my customers who's a sparks with the Docklands Light Railway.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: December 16, 2012 at 5:45 AM
Sources, Kramm in Denmark, they are an OEM supplier to GM etc. in Europe; Armour Auto in the UK, they supply most of Europe.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: December 16, 2012 at 5:46 AM
Wrecked VW's are another they have wonderful little seals at the ends.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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