Neutral Safety Switch wiring question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Peanut74 · 04-17-2022, 09:18 AM

We after a near catastrophe I need to get my neutral safety switch wired in. From looking at the wiring diagram I need cut the purple wire of the ignition switch. I would then reroute the circuit to the safety switch then to the ignition switch. Just want to be sure I splice into the right one.

**Steeveedee** · 04-17-2022, 10:43 AM

Power goes from the ignition switch to the neutral safety switch then to the starter solenoid.

Peanut74 · 04-17-2022, 11:44 AM

Ok, so wire opposite of the way I was thinking of doing it.

As for which wire to cut. On the plug in the picture is it the purple wire?

71meangreenc10 · 04-17-2022, 11:54 AM

Purple is correct. I have to do this as I have a 4sp truck and it was converted to automatic. The harnesses were not corrected.

Smitty

Peanut74 · 04-17-2022, 01:44 PM

Thanks Smitty. Since I have to disect the wire harness I want to be sure I got the right one.

Back story
Grandson was playing in the truck. Knocked it out of gear. Normally this wasn't an issue as the drive shaft was out of it. Well this time the drive shaft was in. Went to start it and it jumped into reverse. Luckily it stalled.

71meangreenc10 · 04-17-2022, 02:35 PM

Not a problem.

Smitty

PbFut · 04-18-2022, 10:24 AM

I too had a close call on my 72 Auto this weekend. Still learning the truck, I am unsure where the safety switch is. Can someone give me a description of location and if they had a similar issue the repair they needed to perform? Seems odd a safety switch has failed. Column looks original and untouched. From the above picture, appears I'll be upside-down on the floor.

**Steeveedee** · 04-18-2022, 10:37 AM

On a column shift automatic, the NSS is on top of the column. Semi-typical failure repair is to put in a jumper wire. That's OK if you know about it. I personally replace the switch. My family can't deal with anything out of the ordinary on vehicles.

AllGoNoShow · 04-19-2022, 03:52 AM

When did these switches become standard? I have a 68 that is a manual an wondering if it has one, or if I should add one.

Peanut74 · 04-19-2022, 05:05 PM

Well I got my NSS in. Not a hard job just a pain trying to solder those heavy wires. Not sure if it's adjusted right as the truck is still on jackstands. That's my way of making sure it's not in gear, a 2nd time, when I start it. Currently working on finishing up the brakes. Once that's done I can test the switch and adjust it if I have to.

04-17-2022, 09:18 AM	#1
Peanut74 Registered User Join Date: May 2018 Location: Prattville, AL Posts: 590	Neutral Safety Switch wiring question We after a near catastrophe I need to get my neutral safety switch wired in. From looking at the wiring diagram I need cut the purple wire of the ignition switch. I would then reroute the circuit to the safety switch then to the ignition switch. Just want to be sure I splice into the right one. Attached Images __________________ -------------------------------------------------------- 1967 C10 "Snowball" (Currently in a million pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" 2012 Jeep JKU "Crush" 1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer) 1971 Chevy Blazer (Sold it)

04-17-2022, 10:43 AM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,112	Re: Neutral Safety Switch wiring question Power goes from the ignition switch to the neutral safety switch then to the starter solenoid. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

04-17-2022, 11:44 AM	#3
Peanut74 Registered User Join Date: May 2018 Location: Prattville, AL Posts: 590	Re: Neutral Safety Switch wiring question Ok, so wire opposite of the way I was thinking of doing it. As for which wire to cut. On the plug in the picture is it the purple wire? __________________ -------------------------------------------------------- 1967 C10 "Snowball" (Currently in a million pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" 2012 Jeep JKU "Crush" 1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer) 1971 Chevy Blazer (Sold it)

04-17-2022, 11:54 AM	#4
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Re: Neutral Safety Switch wiring question Purple is correct. I have to do this as I have a 4sp truck and it was converted to automatic. The harnesses were not corrected. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

04-17-2022, 01:44 PM	#5
Peanut74 Registered User Join Date: May 2018 Location: Prattville, AL Posts: 590	Re: Neutral Safety Switch wiring question Thanks Smitty. Since I have to disect the wire harness I want to be sure I got the right one. Back story Grandson was playing in the truck. Knocked it out of gear. Normally this wasn't an issue as the drive shaft was out of it. Well this time the drive shaft was in. Went to start it and it jumped into reverse. Luckily it stalled. __________________ -------------------------------------------------------- 1967 C10 "Snowball" (Currently in a million pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" 2012 Jeep JKU "Crush" 1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer) 1971 Chevy Blazer (Sold it)

04-17-2022, 02:35 PM	#6
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Re: Neutral Safety Switch wiring question Not a problem. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

04-18-2022, 10:24 AM	#7
PbFut Registered User Join Date: Feb 2022 Location: Ca Posts: 409	Re: Neutral Safety Switch wiring question I too had a close call on my 72 Auto this weekend. Still learning the truck, I am unsure where the safety switch is. Can someone give me a description of location and if they had a similar issue the repair they needed to perform? Seems odd a safety switch has failed. Column looks original and untouched. From the above picture, appears I'll be upside-down on the floor.

04-18-2022, 10:37 AM	#8
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,112	Re: Neutral Safety Switch wiring question On a column shift automatic, the NSS is on top of the column. Semi-typical failure repair is to put in a jumper wire. That's OK if you know about it. I personally replace the switch. My family can't deal with anything out of the ordinary on vehicles. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

04-19-2022, 03:52 AM	#9
AllGoNoShow Registered User Join Date: Feb 2020 Location: Rochester, NY Posts: 200	Re: Neutral Safety Switch wiring question When did these switches become standard? I have a 68 that is a manual an wondering if it has one, or if I should add one.

04-19-2022, 05:05 PM	#10
Peanut74 Registered User Join Date: May 2018 Location: Prattville, AL Posts: 590	Re: Neutral Safety Switch wiring question Well I got my NSS in. Not a hard job just a pain trying to solder those heavy wires. Not sure if it's adjusted right as the truck is still on jackstands. That's my way of making sure it's not in gear, a 2nd time, when I start it. Currently working on finishing up the brakes. Once that's done I can test the switch and adjust it if I have to. __________________ -------------------------------------------------------- 1967 C10 "Snowball" (Currently in a million pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" 2012 Jeep JKU "Crush" 1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer) 1971 Chevy Blazer (Sold it)



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