InsaneAuto86

iTrader: (60)

My swap, 99-02 A4 harness to 95 A4 LT1 (bare bones, no emissions or a/c):

Re-pinned LS1 harness for swap to LT1
C100
A Same pnk- pwr feed from injector fuse #9 Bank 1 (2,3,5,8)
B C101 B pnk- pwr feed from injector fuse #10 Bank 2 (1,4,6,7) (moved from c105 B for simplicity)
C
D C101 G orn- pwr feed from PCM fuse #8 to PCM
E c230 K dk grn serial data signal (moved from c105 E for simplicity, was tan on LT1)
F
G Same pwr feed from ignition fuse #11 (4L60E)
H Same dk blu coolant fan 2 & 3
J Same dk grn coolant fan 1
K

C105
A
B moved to c100
C
D
E moved to c100
F
G
H

C210 (LS1 Does not have this connector)
A Purple wire to starter solenoid
B C230 G Grey fuel pump ground (was blk on LT1)
C
D

C220 White
A generator feed to gauge cluster (spliced into alt wire for voltmeter)
B C220 A tan Oil pressure feed to gauge cluster
C (oil level was eliminated)
D
E
F
G C220 K dk grn/wht vehicle speed signal
H
J C101 D dk grn/wht fuel pump relay control
K Run extra wire off 1998 coolant temp sender

C230 Blue
A
B Same MIL/service engine soon indicator
C
D C105 G wht tach signal
E (unnecessary if VATS is disabled)
F
G C101 E pnk Power to PCM, on LT1 - feed from PCM ignition fuse #5
H C220 D ppl TCC/cruise brake switch
J C220 H PNP switch signal, on LT1 - Park/Neutral feed from trans position switch
K

the_merv

iTrader: (88)

If it's over complicated then find the simpler source..lol
There is a shitload of technical info here that many have used and got their stuff working..

I know for a fact Fuse #11 in the LS1 powers the Coils..that was in the LS1 All Data..so that is how I wired it up.

Bare with me since I dont have my diagrams, but that is what I remember.

Edit:In the LS1 Harness All Data Diagram, Fuse 11, the IGN Fuse, powers the PCM IGNITION, which goes from the Fuse Box to the Connector, then directly to PCM BLUE #19. I edited this and updated it, I looked at a schematic and verified it. I apologize for the confusion.

InsaneAuto86

iTrader: (60)

I cleaned up your thread. I believe my harness is about done. The above diagram is pretty much everything you have helped me out with and I feel should be 100% correct. Just need to confirm the above from post #23 . Again, THANK YOU

the_merv

iTrader: (88)

In a way you have to kinda disregard what the LT1 needs, since you are using a LS1 Harness.

What you need to do it break down the LS1 Harness and figure out what you actually need to power, then find your power sources in the LT1 circuits.

This is all of mine for the Engine..I have one C100 Connector on the Wheel Well with 8 wires total, all of them go to the Fuse Box. The first 6 are circuits that needed power, if I remember right there were only 5 Fused power circuits on my car so I found it easier to make an extra..basically I did a little re-wiring.

C-100 Connector:

PCM BATTERY
PCM IGNITION
INJECTOR BANK 1
INJECTOR BANK 2
MAF/O2's
TRANSMISSON
FAN RELAY CONTROL-LOW
FAN RELAY CONTROL-HIGH

red 95 t/a

So how do i know witch is c210-c100 ect? Im getting ready to swap a ls1 in my 95 t/a starting to take the lt1 out. I understand what to do but where can i get what pin connectors are what? Unless one of you wanna do my harness for me lol jk

the_merv

iTrader: (88)

It tells you on the Pinout Diagrams..it will show a pic and describe the connector a little bit.

chris94

marv if i sent you a wiring harness how much would you charge me

rewiring an ls1 harness and im in memephis tn

the_merv

iTrader: (88)

I've got no prob doin it..give me a few months to get back into country..lol

flame

iTrader: (13)

www.lt1swap.com and www.shbox.com are great sources for wiring info

the_merv

iTrader: (88)

Yes, they have good info there too.

I just updated a couple of things here..I've been updating this one as I've found out more accurate info on things..that and trying to make it more clearer to understand.

the_merv

iTrader: (88)

Your posts moved..but I found your answer.

PM sent.

jpstreetracer95

iTrader: (1)

would a truck harness work for this swap also i have a spare computer out of my truck i could get reflashed.
i was originally going to put a lt1 into a v6 body but i picked up a lq4 the other day fairly cheap. i was going to sell all the lt1 stuff to do the swap.is there any difference in the v6 underhood connections?

-thanks

frankmarroquin

iTrader: (31)

I vote Sticky...+1

NSTIGATR

iTrader: (4)

100E on the LS1 harness tps signal. What happens with it? We are running a victor jr and accufab spped density. MAF and rear O2s tuned out but if that goes to tps what do I do with it and it it goes nowhere what will happen if its not hooked up?

flame

iTrader: (13)

I don't have the diagrams to check right now but I'm pretty sure thats just for the traction control

deuce4935

iTrader: (2)

Not trying to thread jack here but figured since this is a lt1/ls1 post... Is there anyway to use the lt1 maf sensor on an ls swap? The maf plug on the ls harness is 5pin and the lt1 uses a 3pin maf plug. I'm just wondering if theres an aftermarket adapter of some sort.

flame

iTrader: (13)

The LT1 and LS1 cars use the 3 wire MAF and a seperate intake air temp sensor. The 5 wire MAF is on trucks and has the intake air temp sensor built into it. I've seen an adaptor but I don't know who makes them.

Mr9two9

Reading this with interest, I am about to start a ls swap on my 94 caprice. I need to keep the a/c and the car already has a t-56 in it.

NSTIGATR

iTrader: (4)

ok double checked the plug on C100 Pin E on the LS1 harness, it is dark blue and says its for TPS signal. it comes off the plug and tees into another wire that goes to Blue pin 24 on ECM and then to a plug. so any ideas?

second question...

C100
A Same pnk- pwr feed from injector fuse #9 Bank 1 (2,3,5,8)
B C101 B pnk- pwr feed from injector fuse #10 Bank 2 (1,4,6,7) (moved from c105 B for simplicity)
C
D C101 G orn- pwr feed from PCM fuse #8 to PCM
E c230 K dk grn serial data signal (moved from c105 E for simplicity, was tan on LT1)

the wires that came from 105 B and E pins just get spliced in together with these wires so there will be two wires going to one pin? just wanna make sure im understanding this right.

the_merv

iTrader: (88)

What do them wires do on the C-105 that you are wondering if you can splice them together?

I wired it in without an adapter..the wires are the same color. The 3 go to the MAF, the 2 from the AIT Sensor go directly to it..mine works like a charm.