LS wiring harness question
#1
Member
Thread Starter
iTrader: (1)
Join Date: May 2010
Location: Chickamauga, GA
Posts: 426
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
LS wiring harness question
I've almost got my car wired, but had a question regarding the A/C clutch status wire. It's PCM connector 18 and goes to the LS1 C100 connector. Were does this wire go? I've got the A/C compressor wired and the relay set up. Also, the serial data wire goes to the ALDL connector correct?
#2
Senior Member
iTrader: (2)
Re: LS wiring harness question
A 411 PCM, serial data would be DK GRN and run from ALDL to Blue 58. Post #8
https://www.thirdgen.org/forums/ltx-...formation.html
The A/C, there are a few ways to do it. You gave too little information to answer specific to your application but your answer may lie in this thread.
https://www.thirdgen.org/forums/ltx-...ng-i-need.html
https://www.thirdgen.org/forums/ltx-...formation.html
The A/C, there are a few ways to do it. You gave too little information to answer specific to your application but your answer may lie in this thread.
https://www.thirdgen.org/forums/ltx-...ng-i-need.html
Last edited by camarotucker; 11-01-2015 at 08:55 PM.
#3
Member
Thread Starter
iTrader: (1)
Join Date: May 2010
Location: Chickamauga, GA
Posts: 426
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
Re: LS wiring harness question
Thanks for shooting me in the right direction. I'm running the 4th gen A/C compressor with Hawks swap lines.
I'm attempting to wire this thing myself but I'm about ready to say screw it and order a Painless harness. I have all wires extended to run inside the car through the passenger side fender. The only issue I'm having is finding out exactly how to wire the fuse block and relays into the harness. I've read so much crap on here that I've confused myself to the point of tossing in the towel. Wiring just is not my thing... so close to fire this new motor up yet so far.
I'm attempting to wire this thing myself but I'm about ready to say screw it and order a Painless harness. I have all wires extended to run inside the car through the passenger side fender. The only issue I'm having is finding out exactly how to wire the fuse block and relays into the harness. I've read so much crap on here that I've confused myself to the point of tossing in the towel. Wiring just is not my thing... so close to fire this new motor up yet so far.
#5
COTM Editor
iTrader: (22)
Join Date: Mar 2001
Posts: 9,911
Likes: 0
Received 1,857 Likes
on
1,272 Posts
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: LS wiring harness question
I can tell you from experience that another wiring kit won't make it easier. You'll still have to solve all the same problems and more.
Wiring is certainly one of the bigger tasks. Your struggle is normal. Just keep asking well worded and well defined questions and you'll get the help you need.
Wiring is certainly one of the bigger tasks. Your struggle is normal. Just keep asking well worded and well defined questions and you'll get the help you need.
#6
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 35 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Wiring is pretty straight-forward, really...
I tried to minimize harness modifications when I did my two LS1 swaps in 3rd gens. This pic is from my LS swap into a '57 Bel Air - got more into that one out of necessity. Some day I'll go back and do a better job on the LS1/4L60E in the '82 Berlinetta. For now, it works.
I tried to minimize harness modifications when I did my two LS1 swaps in 3rd gens. This pic is from my LS swap into a '57 Bel Air - got more into that one out of necessity. Some day I'll go back and do a better job on the LS1/4L60E in the '82 Berlinetta. For now, it works.
#7
Member
iTrader: (3)
Re: LS wiring harness question
Thanks for shooting me in the right direction. I'm running the 4th gen A/C compressor with Hawks swap lines.
I'm attempting to wire this thing myself but I'm about ready to say screw it and order a Painless harness. I have all wires extended to run inside the car through the passenger side fender. The only issue I'm having is finding out exactly how to wire the fuse block and relays into the harness. I've read so much crap on here that I've confused myself to the point of tossing in the towel. Wiring just is not my thing... so close to fire this new motor up yet so far.
I'm attempting to wire this thing myself but I'm about ready to say screw it and order a Painless harness. I have all wires extended to run inside the car through the passenger side fender. The only issue I'm having is finding out exactly how to wire the fuse block and relays into the harness. I've read so much crap on here that I've confused myself to the point of tossing in the towel. Wiring just is not my thing... so close to fire this new motor up yet so far.
Trending Topics
#8
Member
iTrader: (3)
Join Date: May 2009
Location: Petal Ms.
Posts: 410
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1990 Iroc
Engine: 6.0
Transmission: 4l65E
Axle/Gears: 373 zexel torsen
Re: LS wiring harness question
ok I need to ask, I also installed ls engine in my 90 iroc . I have all the wires hooked up as shown above but my 411 ecm will not send grd to relay to turn the ac compressor on. I can manually grd the relay and compressor comes on. Any ideas?
#9
Supreme Member
iTrader: (24)
Join Date: Jun 2005
Location: NC
Posts: 7,896
Likes: 0
Received 82 Likes
on
53 Posts
Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: LS wiring harness question
If running the F body compressor and OS, then you need a pressure sensor in the AC high pressure line from a 90's LT1 Fbody. The newer PCM uses a pressure sensor to replace hi/lo switches of older systems
#10
Member
iTrader: (3)
Join Date: May 2009
Location: Petal Ms.
Posts: 410
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1990 Iroc
Engine: 6.0
Transmission: 4l65E
Axle/Gears: 373 zexel torsen
Re: LS wiring harness question
I have the pressure sensor in place also, I even checked the grd that the ecm uses to bring the relay in when ac switch is turned on but the grd is not being sent for some reason. The ac system has not been deleted per hp tuner.
Thread
Thread Starter
Forum
Replies
Last Post
LiquidBlue
Interior
7
11-13-2015 02:16 PM