Neutral Safety Switch Wiring Question
Thread Starter
Teching In
Joined: May 2018
Posts: 16
Likes: 0
From: DFW
Neutral Safety Switch Wiring Question Reworking 2005 Corvette LS2 stock harness, has E40 ECU and T42 TCM...
Here are the wires on my Neutral Safety Switch and where they are connected in stock form, still in place from pull out.
Color - Connected to
1) Tan/White - TCM #29
2) Pink - Blue ECU #19
3) Red/Black - Gray ECU #22
4) Yellow - TCM #46
5) Gray - TCM #23
6) White - TCM #39
....and the ones that are throwing me a bit
7) Purple/White - was connected to BCM (believe that was what it was)
8) Black - looks like it was standard ground somewhere in rear of the car
I am running a Shiftworks "horseshoe" style shifter. It seems that there is a neutral safety switch of some sort installed on it too. Are these suppose to be connected together somehow? I will try to post a picture on this as well.
Here are the wires on my Neutral Safety Switch and where they are connected in stock form, still in place from pull out.
Color - Connected to
1) Tan/White - TCM #29
2) Pink - Blue ECU #19
3) Red/Black - Gray ECU #22
4) Yellow - TCM #46
5) Gray - TCM #23
6) White - TCM #39
....and the ones that are throwing me a bit
7) Purple/White - was connected to BCM (believe that was what it was)
8) Black - looks like it was standard ground somewhere in rear of the car
I am running a Shiftworks "horseshoe" style shifter. It seems that there is a neutral safety switch of some sort installed on it too. Are these suppose to be connected together somehow? I will try to post a picture on this as well.
Thread Starter
Teching In
Joined: May 2018
Posts: 16
Likes: 0
From: DFW
Ok another approach possibly? What about this... I connect the neutral safety switch but do the two wire bypass that I have heard of. Not sure of details of how, was not my original plan. I assume this will keep the gear info feeding to the ECM to avoid idling issues. Then just utilize the shifter NSS to do the actual Safety part to protect against starting in gear and get backup lights to work. Is this line of thinking accurate?
I tried to post pics but I guess mod has to approve.
Any insight would be appreciated. Thank you.
I tried to post pics but I guess mod has to approve.
Any insight would be appreciated. Thank you.
Thread Starter
Teching In
Joined: May 2018
Posts: 16
Likes: 0
From: DFW
Almost 200 people looked at this post and nobody can point me in the right direction on this one? I'm raising my Newbie white flag here, help a brotha out... Luckily been tied up a bit with other stuff and waiting on a elusive part to finally arrive. Now I am ready to get this thing in the car.
Last things on list of things to do is figure out:
1) This Neutral Safety Switch issue
2) Set up a fuse box
3) Figure out fuel wiring, etc...
I'm weeks away from getting this thing on the road if I can get these things knocked out. Thank you for your time to whoever can help or point me in the right direction.
Last things on list of things to do is figure out:
1) This Neutral Safety Switch issue
2) Set up a fuse box
3) Figure out fuel wiring, etc...
I'm weeks away from getting this thing on the road if I can get these things knocked out. Thank you for your time to whoever can help or point me in the right direction.
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
You'll have to cuddle up with the wiring diagram, the "neutral safety switch" also handles telling the ECU where the lever is, as well as the TCU, It also handles tap shift on the auto, and the solenoid to release the ignition if its not the cable version. I bet there are even other cute pet tricks in there.
Reworking 2005 Corvette LS2 stock harness, has E40 ECU and T42 TCM...
Here are the wires on my Neutral Safety Switch and where they are connected in stock form, still in place from pull out.
Color - Connected to
1) Tan/White - TCM #29
2) Pink - Blue ECU #19
3) Red/Black - Gray ECU #22
4) Yellow - TCM #46
5) Gray - TCM #23
6) White - TCM #39
....and the ones that are throwing me a bit
7) Purple/White - was connected to BCM (believe that was what it was)
8) Black - looks like it was standard ground somewhere in rear of the car
I am running a Shiftworks "horseshoe" style shifter. It seems that there is a neutral safety switch of some sort installed on it too. Are these suppose to be connected together somehow? I will try to post a picture on this as well.
Here are the wires on my Neutral Safety Switch and where they are connected in stock form, still in place from pull out.
Color - Connected to
1) Tan/White - TCM #29
2) Pink - Blue ECU #19
3) Red/Black - Gray ECU #22
4) Yellow - TCM #46
5) Gray - TCM #23
6) White - TCM #39
....and the ones that are throwing me a bit
7) Purple/White - was connected to BCM (believe that was what it was)
8) Black - looks like it was standard ground somewhere in rear of the car
I am running a Shiftworks "horseshoe" style shifter. It seems that there is a neutral safety switch of some sort installed on it too. Are these suppose to be connected together somehow? I will try to post a picture on this as well.
1 - Purple/White goes to the starter relay (pin 85 or 86, the other side is yellow and goes to the PCM)
3 - Orange/Black goes to the PCM
4 - Yellow goes to the TCM
5 - Tan/White goes to the TCM
6 - Gray goes to the TCM
7 - Black chassis ground
8 - White goes to the TCM
12 - Pink goes to ignition on power, ECM fuse
Trending Topics
Staging Lane
Joined: Jun 2012
Posts: 78
Likes: 3
From: Houston, Tx
May not work in your situation since I used a stand alone wiring harness, but in my 67 Firebird, I retained the original NSS in the stock shifter and used the chassis starter solenoid wiring (purple color).
You can probably do the same thing with the stock NSS in the horse shoe shifter, and skip the ECU wiring.
You can probably do the same thing with the stock NSS in the horse shoe shifter, and skip the ECU wiring.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Teching In
Joined: May 2018
Posts: 16
Likes: 0
From: DFW
Thank you for those who have replied here. I have tried to post a few pics and would put a few more but Mod hasn't approved them yet, guess they are busy. A few points of clarification.
This LS2 is out of a Corvette so I think that the wire colors are a bit different than the traditional diagrams that I typically see. In fact, I can not seem to locate the Pin out for that one at all. The numbers that I stated were not Pin numbers, they were just counting off the numbers that I have. Tough to find the Corvette Pin Outs on stuff for some reason... The wires referenced were already connected where they are as mentioned so I know those are right. I just don't want to assume how to connect the rest and have to tear it out later due to electrical issue that can be avoided.
The reason that I want to retain the use of the switch from the Tranny side is from my understanding this will ensure better engine performance by feeding the TCM/ECU information and avoid idling issues and the like. I am fine with it not acting as a true Safety Switch, I am fairly certain that I can do that with the shifter set up from Shiftworks, which I have not heard back from yet either.
Link for Shifter is here: https://shiftworks.com/collections/c...=1741393166357 Not promoting this, just for informational purposes.
Advice on how to connect this would be a tremendous help, happy to study the diagrams if I had them, Was able to navigate the harness, no problem with the proper pin outs. Complete Newbie, first Classic, first Swap, but eager to learn the Right way to get this done. Thank you again for your time everyone.
This LS2 is out of a Corvette so I think that the wire colors are a bit different than the traditional diagrams that I typically see. In fact, I can not seem to locate the Pin out for that one at all. The numbers that I stated were not Pin numbers, they were just counting off the numbers that I have. Tough to find the Corvette Pin Outs on stuff for some reason... The wires referenced were already connected where they are as mentioned so I know those are right. I just don't want to assume how to connect the rest and have to tear it out later due to electrical issue that can be avoided.
The reason that I want to retain the use of the switch from the Tranny side is from my understanding this will ensure better engine performance by feeding the TCM/ECU information and avoid idling issues and the like. I am fine with it not acting as a true Safety Switch, I am fairly certain that I can do that with the shifter set up from Shiftworks, which I have not heard back from yet either.
Link for Shifter is here: https://shiftworks.com/collections/c...=1741393166357 Not promoting this, just for informational purposes.
Advice on how to connect this would be a tremendous help, happy to study the diagrams if I had them, Was able to navigate the harness, no problem with the proper pin outs. Complete Newbie, first Classic, first Swap, but eager to learn the Right way to get this done. Thank you again for your time everyone.
Thread Starter
Teching In
Joined: May 2018
Posts: 16
Likes: 0
From: DFW
A pic would help. I'm guessing the numbers you have by those wires are just the way you numbered them and not the actual pin location number in the plug? Because what I have is different.
1 - Purple/White goes to the starter relay (pin 85 or 86, the other side is yellow and goes to the PCM)
3 - Orange/Black goes to the PCM
4 - Yellow goes to the TCM
5 - Tan/White goes to the TCM
6 - Gray goes to the TCM
7 - Black chassis ground
8 - White goes to the TCM
12 - Pink goes to ignition on power, ECM fuse
1 - Purple/White goes to the starter relay (pin 85 or 86, the other side is yellow and goes to the PCM)
3 - Orange/Black goes to the PCM
4 - Yellow goes to the TCM
5 - Tan/White goes to the TCM
6 - Gray goes to the TCM
7 - Black chassis ground
8 - White goes to the TCM
12 - Pink goes to ignition on power, ECM fuse
Purple/White goes to the starter relay (pin 85 or 86, the other side is yellow and goes to the PCM)
Black - looks like it was standard ground somewhere in rear of the car
I am pretty sure that this is the getting to the correct answer to what I am looking for. I think that where I was getting thrown off is it being routed through the BCM. Guess it may have been routed back as I think you are stating. Ground is easy, no problem there.
Purple/White wire though... So with one, would I need to put an inline fuse correlating to what it would have had on the BCM then route it back to the Pin that you are referencing? I do not have PIN 85 or 86...Maybe equivelant would be #13 on Blue ECU Connector? Logic seems correct, but I am no electrical guru.
http://corvetteforum.shelor.net/Corv...tor_Pinout.htm ---This is my Corvette Pin Out for ECU