LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

lt1 3rd gen swap pre-made wiring harness

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Old 10-28-2012, 10:15 AM
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Car: 99 SS G2
Engine: 389 rwhp ls1 n/a
Transmission: viper spec t56
lt1 3rd gen swap pre-made wiring harness

ok... so it's taking wayyyyyyy too long for us to get the wiring done, my tags are about to expire and i can only secure about two hours of help every other weekend from the person who i trust helping me on this project. it's been ongoing for a while now. it should take a weekend to do.

i need to get this damn car running and out of my shop so i have room for my actual work work for the winter.

can someone please link me to one of the wiring kits that everyone's talking about?

preferably the best one?

besides that, i have a lot of broken connections on the harness we're using, and i'd rather just replace all of it at this point.

91 camaro with a 95 LT1.

thanks...
Old 10-28-2012, 01:52 PM
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Re: lt1 3rd gen swap pre-made wiring harness

There are NO kits that just plug in and work except from speartech, and myself available.

A standalone harness that most people think will just get everything done is only a replacement for the LT1 half of the harness you have.
Old 10-28-2012, 02:54 PM
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Re: lt1 3rd gen swap pre-made wiring harness

Standalone harness:




Actual complete LT1 thirdgen harness:



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Notice a few things missing in the first harness ?

A standalone harness will gain you nothing other than an extra fuse block that isnt needed, yes it will make the engine run, but no different than hooking 4 wires up to your existing stock harness. You'll be missing: C100 connector and all associated wiring, power feeds, alternator wiring, relays for the fans and all the fan wiring,reverse light wires, C207 underdash connector for the speedometer (as well as connection to the fuse block thats already in the car and should be used instead of adding more unneeded parts).
Old 10-28-2012, 05:07 PM
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Re: lt1 3rd gen swap pre-made wiring harness

What is all ran off of the C100 connector that makes it necessary? If you have a non AC car and plan on redoing the stock dash gauges what else is connected/ran off of it that makes it needed?
Old 10-28-2012, 05:51 PM
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Re: lt1 3rd gen swap pre-made wiring harness

You can wire this thing up yourself in a weekend, it will take you about 24 hours in all your first try, give or take. You have to learn how to read both diagrams for your car and the car it came from. But it's like putting together a puzzle, once your car starts for the first time you will appreciate all the hard work you put into x10. If you need any help just ask and i will do my best.

Then i read you trying to get it out of your shop asap, If you don't mind me asking do you have an actual education for mechanic shop work or is this just shade tree mechanic?

Last edited by 89rs454; 10-28-2012 at 06:00 PM.
Old 10-29-2012, 12:12 AM
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Re: lt1 3rd gen swap pre-made wiring harness

Originally Posted by Verhagen82
What is all ran off of the C100 connector that makes it necessary? If you have a non AC car and plan on redoing the stock dash gauges what else is connected/ran off of it that makes it needed?
Power feed wiring to the whole car, wiper wiring in earlier cars, power for the fan relays, not to mention even if you are installing aftermarket gauges, unless they are something like full sweep with 3 wire sending units it doesnt make much sense to route wires through a non stock hole rather than just connecting the gauge sending unit wires through the original wiring.


While yes you can end up getting a harness together, after seeing many peoples wiring that has been done with "writeups" its what causes people to have issues diagnosing when things are an issue, poor fit, and potential fire hazards. This is really something that if you dont know exactly what you are doing and cant do it without online help you probably shouldnt be doing it, in the end an engine fire, or the hours diagnosing an issue because things werent done right, just isnt worth it.
Old 10-29-2012, 08:48 AM
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Re: lt1 3rd gen swap pre-made wiring harness

Originally Posted by Verhagen82
What is all ran off of the C100 connector that makes it necessary? If you have a non AC car and plan on redoing the stock dash gauges what else is connected/ran off of it that makes it needed?
When you look at the dark side, careful you must be.
For the dark side looks back.

c100:
pwr dist ign switch
brake sensor
starter
grd
oil pressure
tach
ign
fuel pump relay
pwr dist block
fan relay

I do strongly agree with Z28ricer


May The Force Be with You Verhagen82

Last edited by nothingbutagthn; 10-29-2012 at 08:49 AM. Reason: corrections
Old 10-29-2012, 10:53 AM
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Re: lt1 3rd gen swap pre-made wiring harness

Originally Posted by 89rs454
Then i read you trying to get it out of your shop asap, If you don't mind me asking do you have an actual education for mechanic shop work or is this just shade tree mechanic?
I own a motorcycle shop here n Austin, we primarily work on 1980-2012 japanese bikes. but... can work on anything..
http://redacesmoto.com

Coming into the fall, powder coating is picking up and bike repair is slower, so i have time to work on the camaro and the space to do it. but... once winter rolls around people will start bringing in full restorations and rebuilds, and i'll need the space again. last winter we had 15 bikes that took all winter to do, and several quick in and outs in the meantime. so that's why i was complaining about needing the space. if it's anything like last year, i'll have more bikes than i have room lol.

--------

Last weekend i was out of town, but, they came and worked on the car without me. i didn't know what they got done, but apparently once we fix the fuel send unit (old wire needs to be soldered back onto the fuel gauge thingy), put the plug wires on it and button up a few small things, we should be able to turn the key and make the motor come to life maybe today, or ... next weekend. lol so that's a plus.

i had no idea they got that far with it.

meanwhile, today, i'm going to weld up the Y-pipe and all that. ran out of welding wire the other day so didn't get to do it over the weekend.

may even put the radiator back in and try to figure out what i need to do about hoses and all that.
Old 10-30-2012, 08:15 PM
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Re: lt1 3rd gen swap pre-made wiring harness

Z28ricer seems to know his stuff on wiring, for time and acuracy I would use his stuff, even though he likes to dig at me I will recomend him. I have done a many an EFI swapps over the last 30 years, just never took the time to make it repeatable as he has.
Old 10-31-2012, 12:05 PM
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Re: lt1 3rd gen swap pre-made wiring harness

Originally Posted by Tinbender
Z28ricer seems to know his stuff on wiring, for time and acuracy I would use his stuff, even though he likes to dig at me I will recomend him. I have done a many an EFI swapps over the last 30 years, just never took the time to make it repeatable as he has.
I wasnt trying to dig at you if thats what you really think, after you've been around here for a while you'll see people just posting to post their links, bots to do it just for advertising, etc, there were two posts in a row where you posted very little relevant to the thread and then the link to how you did things on a truck, thats all.

Trust me i've got a lot of time and effort into what it takes for me to convert a harness to the quality of the end product I offer. After having seen numerous other converted harnesses with things like wrong wire sizing, wires extended in multiple spots along the same wire, with different colors and sizes of wire, poor soldering, just cheap $.50/roll tape used to cover underhood connections etc, fusible links eliminated, its disappointing to hear when other people think they can just slice their way to something "just as good" in a weekend, or even several, when none of them would even come close to GM guidelines for modification of the wiring.

But at the same time, if someone actually needs help diagnosing one of those hacks, or help with what to connect to where, you wont see me holding back info as a result, at all.
Old 01-07-2013, 01:49 PM
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Re: lt1 3rd gen swap pre-made wiring harness

Originally Posted by Z28ricer
I wasnt trying to dig at you if thats what you really think, after you've been around here for a while you'll see people just posting to post their links, bots to do it just for advertising, etc, there were two posts in a row where you posted very little relevant to the thread and then the link to how you did things on a truck, thats all.

Trust me i've got a lot of time and effort into what it takes for me to convert a harness to the quality of the end product I offer. After having seen numerous other converted harnesses with things like wrong wire sizing, wires extended in multiple spots along the same wire, with different colors and sizes of wire, poor soldering, just cheap $.50/roll tape used to cover underhood connections etc, fusible links eliminated, its disappointing to hear when other people think they can just slice their way to something "just as good" in a weekend, or even several, when none of them would even come close to GM guidelines for modification of the wiring.

But at the same time, if someone actually needs help diagnosing one of those hacks, or help with what to connect to where, you wont see me holding back info as a result, at all.


Whats the pricing on an LT1 Harness for 91 RS I have both Harnesses. you can PM me
Old 04-25-2013, 07:44 PM
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Re: lt1 3rd gen swap pre-made wiring harness

Z28ricer can u give me a run down on a lt1 swap like what I would need n do I have a 88 formula with a tpi 305 if u could I greatly appreciate it
Old 04-25-2013, 08:45 PM
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Re: lt1 3rd gen swap pre-made wiring harness

Originally Posted by jj tanguis
Z28ricer can u give me a run down on a lt1 swap like what I would need n do I have a 88 formula with a tpi 305 if u could I greatly appreciate it
Not to sound kike a snooty smart allick or anything, but there are about 1500 posts on the forum about that exact thing, even sections and stickies dedicated specifically to step by step things to loom out for.

Which is how I did mine.. which by the way, is running, driving, inspected, and doing well. Haven't taken the time to update old posts.

But here's a rundown... 1 buy his harness. If I ever do this again, I wont screw with doing that again.

2 it depends what car you get the motor out of.

The issues I had were, intake, power steering hoses, a stupid bracket I had to cut for the ac pump to fit, welding custom y pipe to fit, wiring NIGHTMARE that is still technically about 90% done, speedometer, tach, sensors , and a ton of little things, that honestly, the forum doesn't mention anything about that cause you to be creative like mounting the ps reservoir and computer, etc... plus other things... not a hard swap but buying his harness would have made this a 3 weekend job rather than an 6 month job.

With that said, I have a 99 camaro ss with an ls1 and t56 I'll sell you for 4000. Ls6 intake blah blah, pushes 389 to the pavement dyno verified by previous owner. Needs trans rebuild. I say 4000. Because I know a lot of the interior stuff would make its way into your car too. If I didnt just stick this lt1 in mine, id do exactly that.
Old 05-16-2013, 08:52 PM
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Re: lt1 3rd gen swap pre-made wiring harness

R u still making harness n does it matter if I have a 97 lt1 out of the z28 I have a 88 formula if u can get back to I would appreciate it thank u
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