C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

What is this?

Thread Tools
 
Search this Thread
 
Old Aug 29, 2021 | 11:39 PM
  #1  
wiesleya's Avatar
wiesleya
Thread Starter
4th Gear
 
Joined: Aug 2021
Posts: 4
Likes: 0
From: Ohio
Default What is this?

Any experts here who can tell me what this cable entering the transmission is for? This is a 1971 L48. I’m asking as my reverse lights only come on as I shift from park to reverse and once I hit reverse they’re off. Could this be part of the issue? The fact the lights work at all leads me to believe they’re wired correctly, but that they don’t stay on when fully into reverse makes me think some connection inside the transmission to that sensor isn’t operating as it should. To be specific it’s the 2 wires leading into the transmission near the center of the attached image.
Reply
Old Aug 30, 2021 | 03:31 AM
  #2  
Greg's Avatar
Greg
Just another Corvette guy
Supporting Lifetime Gold
20 Year Member
 
Joined: Feb 1999
Posts: 8,518
Likes: 3,865
From: Palm Springs, CA.
Default

Your neutral safety switch is out of adjustment.
Reply
Old Aug 30, 2021 | 06:34 AM
  #3  
Rescue Rogers's Avatar
Rescue Rogers
Is my vette stock?? HAHA
Supporting Lifetime Gold
Veteran: Navy
10 Year Member
Community Builder
Loved
 
Joined: Oct 2015
Posts: 20,222
Likes: 9,359
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Default

I would think your reverse switch would need adjustment. That cable may be your shift cable. Can you have some one run it through the gears while you see if it moves. YOur neutral safety switch would be out of adjustment if the car wouldnt start
Reply
Old Aug 30, 2021 | 09:17 PM
  #4  
wiesleya's Avatar
wiesleya
Thread Starter
4th Gear
 
Joined: Aug 2021
Posts: 4
Likes: 0
From: Ohio
Default

Originally Posted by Rescue Rogers
I would think your reverse switch would need adjustment. That cable may be your shift cable. Can you have some one run it through the gears while you see if it moves. YOur neutral safety switch would be out of adjustment if the car wouldnt start
How do I adjust the reverse switch? Are there any online guides you could point me to? The car starts and runs great through all gears so it doesn’t sound like a neutral switch issue per your note. If I have someone watch the cable as I shift what am I watching for?
Reply
Old Aug 30, 2021 | 09:43 PM
  #5  
Mooser's Avatar
Mooser
Race Director
10 Year Member
 
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Default

FWIW, that "sensor" with the wires on it is the kickdown for the TH400.

The neutral safety / reverse switch with it's limited adjustment in on the side of the shifter. You need to remove the shifter plate to get at it.


M
Reply
Old Aug 30, 2021 | 10:16 PM
  #6  
Peterbuilt's Avatar
Peterbuilt
Le Mans Master
15 Year Member
 
Joined: Aug 2006
Posts: 7,427
Likes: 1,560
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Default Does this help?

Originally Posted by wiesleya
How do I adjust the reverse switch? Are there any online guides you could point me to? The car starts and runs great through all gears so it doesn’t sound like a neutral switch issue per your note. If I have someone watch the cable as I shift what am I watching for?


The cable can be fixed later, your problem is the NSS switch is out of adjustment or gone bad but adjust first
Reply
Old Aug 30, 2021 | 10:25 PM
  #7  
Peterbuilt's Avatar
Peterbuilt
Le Mans Master
15 Year Member
 
Joined: Aug 2006
Posts: 7,427
Likes: 1,560
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Default Read this


Reply
Old Aug 31, 2021 | 01:28 AM
  #8  
Greg's Avatar
Greg
Just another Corvette guy
Supporting Lifetime Gold
20 Year Member
 
Joined: Feb 1999
Posts: 8,518
Likes: 3,865
From: Palm Springs, CA.
Default

Originally Posted by Rescue Rogers
I would think your reverse switch would need adjustment. That cable may be your shift cable. Can you have some one run it through the gears while you see if it moves. YOur neutral safety switch would be out of adjustment if the car wouldnt start
They are one and the same switch on Corvettes with automatic transmissions like wiesleya posted in his pic. Only standard transmissions have a separate reverse switch.
Reply

Get notified of new replies

To What is this?

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo




All times are GMT -4. The time now is 05:10 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE