firefighting1101

iTrader: (48)

So i looked in the stickies, and couldnt find anything, and i searched and nothing again. is there a write-up on pulling the wiring harness apart to get rid of all the un used wiring? i deleted a lot of stuff from the car and dont need all the extra wiring, im just afraid to butcher the harness. thanks for the help guys.

jmill96Z

iTrader: (3)

I used painters tape and started labeling sensor connections. Then, just find a wiring schematic and start trimming.

ATwelveSec02Z28

iTrader: (17)

I got a wiring schematic from AllData it was pretty good, they have the body harness schematics too.

firefighting1101

iTrader: (48)

Did you just trim the harness or did you remove the pins from the pcm too? If I just trims away the unused wires I think it should be pretty easy.

SScam68

iTrader: (20)

I removed the pins. Found plenty of diagrams/writeups/pin assignments on this site.

Also depends on how clean you want the harness. I yanked both internal and external harnesses, layed them out on the floor and chased each wire to the source.

Your finger tips are going to hurt ;-)

csjta2

iTrader: (43)

I removed pins also

Plan to spend alot of time on it, get a wiring diagram and take your time

I think I have about 40 hours mine

NSTIGATR

iTrader: (4)

yea definitly not something you want to hack at. take your time.

9sec93

iTrader: (67)

you'll definitely want to pull the pins out. dont leave anything hanging there that can short out. i just cut all the wires out first then when i was done, removed all the pins of the cut wires. took only one night using a schematic. i think i removed a good 40 wires. i also made it a stand alone and put the computer inside the car.

ty_ty13

iTrader: (42)

i suggest spending the time working over time rather than the hours pulling 10lbs or less of wire and buy your self some nitrous or other go fast parts.

a98ws6

iTrader: (48)

I remember reading on here about a company that did this for you. You just sent them your harness and they removed the wires you didn't need and sent the harness back with everything labeld where it goes. Can't find it though?

a98ws6

iTrader: (48)

Also I think a lot of people here aren't really worried about the weight of the wires rather than cleaning up the mess of unused wires and connectors.

Beaflag VonRathburg

iTrader: (176)

I typed out a response last night and deleted it on my phone on accident...

I went through and labeled all of the plugs when I removed them. I tried using alldata, but for me it didn't make any sense. It helped on a couple things, but mostly just confused me.

When I started I would choose a plug that I knew I would no longer be using. I then chased all of the wires from that plug to see what they tied into. The factory harness has a lot of odd circuitry. Weird things tie into each other like the power seat and the rear defroster. Follow all of the wires before you start trimming them.

I removed all of the wires from the connector that plugs the interior harness into the underhood harness. I left most of the ones running out of the fuse box though. If I ever need power I can just tie into those.

Taubr Unit

iTrader: (32)

You are right, Speartech, there a sponsor on here -----> http://www.speartech.com/ Its $450 for them to rework your factory harness. And from what i hear hes a ex-employee from GM. He was a wiring engineer, we bought a 4l60e swap harness for my buddys ls1 car and it was nothing but QUALITY. He uses all GM factors plugs and seals. Little pricy but worth it IMO knowing that nothing is gonna short out or fry a pcm.

firefighting1101

iTrader: (48)

im thinking im giong to just remove the enitre harness internal and external and try to follow along with the schematics and trim what i dont need. i really want to engine bay to be clean looking, and get rid of what ever extra weight i can...

SScam68

iTrader: (20)

It wasn't so much about the weight for me. I just wanted a clean looking engine bay with no loose hanging wires and plugs.

Next project is to get rid of the OEM fuse boxes and replace and relocate them inside the car. I have to pull the engine anyway.

Beaflag VonRathburg

iTrader: (176)

It does take a massive amount of time. I am partially color blind and it made it a lot more complicated and difficult.

9sec93

iTrader: (67)

yeah i can see where that would complicate things quite a bit when looking at a wiring diagram that has all the wire colors listed.

firefighting1101

iTrader: (48)

i am color blind...lol maybe i will just pay someone to do it for me lol


or maybe not. i just called speartech, and their harness is a stand alone setup. it wont plug into any of the external harness. so no ignition, guages, lights etc. so back to the drawing board. i guess i am going to be pulling it all out myself... if anyone in south florida wants to help ill buy the beer!

Josh@KY-Turbo

iTrader: (120)

The engine harness is nothing when you dive into doing the Chassis harness.
Next time around I will do a Painless setup.

spaulding

iTrader: (1)

thats what i did was turned my stock engine harness into a homemade standalone harness keeping the gauges and just workin through the harness witha diagram and goin by what sensor plugs i needed to keep then shorten/lengthened the wires accordingly and then used a painless harness for the chassis ive got lights,radio and power windows and mirrors on the painless harness and then just the essentials on the engine harness with the painless setup i just have a fuse block on the inside firewall with my other relays and nitrous acc in the glove box...i ran the chassis harness up on the inner fender on the pass side down through the core support and then ran the engine harness out the divit where the center bolt for the hvac box was just used a small hole saw behind the intake theres barely anywires under my hood just running to the injectors and misc sensor,also with out the hvac in the way my coilis are under the dash