Nuetral safety switch for 4L60E
 

I installed a 4.8 from a 2007 GMC Sierra with a 4L60E transmission with a Lokar column shifter and it is super. I have been running it without a neutral safety switch, and now realize the Lokar BL 1400 U neutral safety/backup light switch will not work without modification. Has anyone adapted one of these to work, or do something else? Thanks, Tbrown

Re: Nuetral safety switch for 4L60E
 

I use a stock nuetral safety.

Re: Nuetral safety switch for 4L60E
 

I get that, and I just looked, and the stock one is on there so I just have to figure out how to wire it in. Thanks.

Re: Nuetral safety switch for 4L60E
 

1966 c10 neutral safety switch wiring

This is better.

http://67-72chevytrucks.com/vboard/s...d.php?t=283712

Re: Nuetral safety switch for 4L60E
 

This is the the harness on the 4L60E transmission that you would think the power goes thru for the park/neutral start and the backup lights. Can I run power in and out for the starter and backup lights? Does anyone know the exact wires to use?

Re: Nuetral safety switch for 4L60E
 

That isn't the plug a 2007 should have, that's the older one that used two plugs. Yours should only have one bigger plug on it. That said, you can wire the back up lights straight to the switch, but to use the neutral safety function part of it you will need to wire in a starter relay. I can tell you how to wire it, but first you need to look and see exactly which switch you have.

Re: Nuetral safety switch for 4L60E
 

OK, nova 71, Thanks for the info. I see what you mean on the bigger plug. I downloaded the pinout and made a picture. Haven't got back to working on it, but would appreciate knowing how you wired yours. Don't want to make a stupid mistake now! Thanks, Tbrown

Re: Nuetral safety switch for 4L60E
 

Back up lights are simple, ignition power to the pink wire on pin 11 (on the NSS connector) then the gray wire on pin 10 goes directly to the lights.

The neutral safety part is a little more involved since you need to add a starter relay to keep from burning up the switch straight away. The purple wire that comes from your ignition switch that you currently have going to the starter solenoid needs to be hooked to the pink wire on pin 12 (on NSS plug). Then the dark green wire on pin 1 will go to terminal 85 on the relay. Terminal 86 will go to ground. Terminal 30 will be constant power from the battery and then 87 will go to the starter solenoid.

Re: Nuetral safety switch for 4L60E
 

Thanks nova71. Will be out of town for a week so I will have it all planned out when I get back. Tbrown

Re: Nuetral safety switch for 4L60E
 

Any follow up on this?

Re: Nuetral safety switch for 4L60E
 

I used the stock GM switch that was on my 4L60E for both reverse lights and neutral safety switch. you can picked them up new relatively cheap too. try rock auto. i purchased a plug for this switch with pig tail i think from rock auto? Install it over the shaft with 2 bolts and pin it out . There are 2 different style plugs and wire diagrams so make sure you get the correct one for your switch. There are about 10 wires on the switch most of those illuminate the P-R-N-D-4-3-2-1 indicators. you wont use those. You will just use the ground. and the hot wire when in " P" and the hot wire when in "R" - Very simple.

If I remember correctly- the after market type switches only allow 1 or the other function not both like the OEM. Good luck

Re: Nuetral safety switch for 4L60E
 

Started sorting out my wiring and mounting the relay for the neutral safety switch. all is going well so far and found all the wires I need and won't have to drill any more holes in the firewall. Going to wire up the back up lights first to make sure I am on the right track. I don't mind wiring, but really take my time so I don't have any issues. Thanks for the advice Nova 71, hopefully I can cross this project off my list in a couple of days. Tbrown

Re: Nuetral safety switch for 4L60E
 

Finished wiring it up today and everything works fine. Just have to tidy up the wires and get everything in loom. Thanks again Nova 71. This site is awesome! Tbrown

Re: Nuetral safety switch for 4L60E
 

So does anyone know how many wires in the harness on the neutral safety switch are actually used besides the pins 1,10,11, and 12?

Re: Nuetral safety switch for 4L60E
 

Pins 4,5,6,7 and 8 are also used. Pin 7 is a ground and the other four wires go to the PCM. So nine wires total will be used. There are a couple extra wires that are for the shift interlock, but unless you have a factory column, that will be hard to hook up.

Re: Nuetral safety switch for 4L60E
 

So the two wires I need in the NSS are pin 12 pink (12VDC) and pin 1 dark green (ground)
and the relay.
I take it this is the park position only and not the neutral position, so the engine will not start in neutral, correct?

Re: Nuetral safety switch for 4L60E
 

No, it will start in park and neutral. If you used the shift interlock wire, pin 9, it would only start in park, but I don't know why you would want to do that.

Re: Nuetral safety switch for 4L60E
 

No I want it to start in P and N, just making sure I was following directions!

Thanks for the help Nova

Re: Nuetral safety switch for 4L60E
 

hello to all. im trying to understand this thread. i was able to hook my reverse lights up to the plug that tbrown5079 has listed and it works properly. i want to use this to hook up the park neutral switch feature but what is Pin #12?

Re: Nuetral safety switch for 4L60E
 

The pic he posted is the older switch, the numbered pins I have referred to are on the newer style one. If you have the old switch, it wires up the same, but the numbers are replaced with letters on the plugs and the wire colors are different. It would wire up as follows...

The purple wire that comes from your ignition switch that you currently have going to the starter solenoid needs to be hooked to the purple/white wire on pin E (on NSS plug). Then the yellow wire on pin G will go to terminal 85 on the relay. Terminal 86 will go to ground. Terminal 30 will be constant power from the battery and then 87 will go to the starter solenoid.

Re: Nuetral safety switch for 4L60E
 

Thanks @ls1nova71. i was confused with the number #12.

Re: Nuetral safety switch for 4L60E
 

I know this is an old post and I have looked all last night and this morning for a NSS wiring diagram for my 4l60e that has the two plugs. This is the best one I found and hope I got it right.

The picture shows how I am taking the wiring to go from looking though a ton of forum posts. If I am wrong please correct me, do not have a column for my truck and was going to buy a new one with the NSS but found the 4l60e had it on the shift arm. Prefer this since the column I want does not provide a nss on them.

Re: Nuetral safety switch for 4L60E
 

I did the same thing you are about to do. I did not have a steering column neutral switch so Went with the one on the trans shaft. I had to change my shaft as my 460 came out of a Camaro and it had a shifter switch. Anyhow I am looking for my wiring dia. when I find it i Will post it. I had to buy the pigtail also along with the switch. Search one of my prior threads (8-8-20) I think I show how I wired it.

Make sure you use a relay to put power to your park and neutral switch. If you don't the amps will smoke your switch.

Re: Nuetral safety switch for 4L60E
 

What's written in the yellow box on the left is correct, but it's missing the ignition voltage on pin C to power the back up lights. The black/white wire in pin D will be grounded in the harness already, no need to do anything with that one. The other plug are the wires that go to the PCM, you shouldn't have to do anything to them either, just leave them alone.

Re: Nuetral safety switch for 4L60E
 

For pin D my psi harness does not come with anything that goes to this switch, i will be pulling the pigtail off the stock harness for it and using those wires to go out to everything I need them to.