LS1LT1 Forum banner

Engine harness Repair

2767 Views 9 Replies 4 Participants Last post by  tylerwerrin
Hi guys,

The wiring harness in my car is in need of some repair; i'd like to re-do the fuse-block to make it smaller, remove un-needed wires and make it look more attractive for my engine bay. There's a horrible tangle going on right now.

What are some replacement loom brands/products that you guys have used to make your engine bays sparkle? Any other tips or tricks that you could recommend?

1 - 10 of 10 Posts
that split loom stuff (like the factory uses) is ok for a start.

once you start deleting unnecessary stuff (unused emissions connectors) the amount of wires in your bay shrinks considerably, and you can improve routing quite a bit without cutting a single wire.

there are low heat and high heat versions of the split loom stuff. the low temp stuff is plenty good (and cheap) for the sections running to the fuel rails and ECM, you'll want thicker high temp split loom for other sections that actually run downwards past your engine.

that spiral wrap is another way to go. it's good because wires can enter/exit it and any point or any angle without doing a tape job. it looks good, and you can get very high temperature versions of it as well. i'll be using it next time for sure..

i did seperate harness runs just for the injectors this time, thinking it'd look good and i could use slimmer looming.. but i dont think i'd do that again.

to protect short runs that have to exit the loom and reach a sensor, you can either use electrical tape for protection, use thick shrink tube (looks a lot better). of course you'll have to actually de-pin each connector you do that with shrink tube..
See less See more
oh yeah, splices..

the factory splices (the ones for injector power, filtered and unfiltered grounds..) they're pretty unnecessarily thick.. redoing those should be your first priority, especially since you'll probably pull a bunch of stuff out of them..
which factory splices are you referring to? I already hacked off some of the wires from before -- i am using a 1996 harness, but the engine is a 1995. I've removed the rear O2 sensors, ABS connector, power steering pressure, windshield wipers, smog pump, etc. The stock fuse block that I have (B-body harness) is so big and bulky, and I don't need the smog pump relay anymore.
you'll see those splices when you take the harness apart. notice you have two pink wires coming in, and eight coming out.. two black/stripe wires going in, and a bunch coming out... there's some big ugly splices in the harness to make that happen.
Does his have anything to do with an LS based engine?
my engine in particular isn't an LS1, it's an LT1 -- but i assumed that this post could work for either. My harness has been through alot, and I could imagine other LS1 & LT1 users alike could be in a similar position.

thanks on the suggestions so far -- the heat shrink tubing style loom looks the best by far, and the "flex" loom is a close second. The only problem with the flex loom is that I'd have to depin all the connectors first, which is a big pain. I don't mind depinning small runs of wire (like for injectors, etc).
if by flex loom you mean that stuff that looks like webbing; you'd be suprised. that stuff will spread pretty wide, you can get most connectors through it.
I forget where I saw it, but there was a post recently where the wiring from pcm, running along passenger inner fender was routed under the inner fender. Made it look clean.
I've seen the loom that expands, I think it is called tech flex. The same company makes a split loom variety. I am wondering if I would have to cut holes in the stretch loom for the connectors to go through, or if the loom would stretch wide enough. The factory harness is corrugated plastic split loom, and that stuff is relatively cheap; I was just thinking of ways to make it look even nicer than it did new stock. Any more ideas?
1 - 10 of 10 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.