Back up light switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

red71cheyenne · 05-25-2010, 09:21 PM

Hey all, I know my backup light switch is on the tranny, but I don't know where the wires go from there. I also can't find the wires. Does someone have any pics of where the wires start and end? Thanks in advance.

BLUE THUNDER · 05-25-2010, 10:10 PM

Mine don't work either. Please post some pics.

71meangreenc10 · 05-25-2010, 10:17 PM

What year tranny? Should be on the column....

Smitty

addicted2dunes · 05-25-2010, 10:37 PM

Quote:

Originally Posted by 71meangreenc10

What year tranny? Should be on the column....

Smitty

Agreed, it's built into your neutral safety switch.... it's the one that is semi-circle at the bottom of the column, should have four wires or so on it.

BLUE THUNDER · 05-25-2010, 11:23 PM

Thats where mine is. Are they cheap?

addicted2dunes · 05-26-2010, 02:19 AM

Pretty reasonable.... $15-25

addicted2dunes · 05-26-2010, 02:20 AM

$13 at AutoZone

red71cheyenne · 05-26-2010, 03:17 PM

This is for standard transmission, not automatic. There is a switch on the side of the SM465 for the wires, but not sure where they go to from there. Anyone?

cleszkie · 05-26-2010, 08:09 PM

One of the wires from the switch on the SM465 goes to battery power (keyed). The other goes to the lights. When the tranny is shifted into reverse, the switch is closed, sending juice to the lights.

red71cheyenne · 05-26-2010, 08:35 PM

Quote:

Originally Posted by cleszkie

One of the wires from the switch on the SM465 goes to battery power (keyed). The other goes to the lights. When the tranny is shifted into reverse, the switch is closed, sending juice to the lights.

Thanks, I was thinking that might be how it worked. Don't suppose you have pics of the connections do you? The wiring diagram shows the wire is light green going to the backup lights, but still not sure how power is getting there unless its getting switched somewhere under the dash. Was hoping someone had a pic of the connector at the tranny, then where it goes inside the cab. It has to get power either from the stop switch or the fuse box.

THENEWMEXICAN · 05-27-2010, 01:01 PM

obviously mine doesn't work cause nothing is plugged into it...

and even if it was, I'm missing the "Backing lp. sw. conn" that the LG and DG wires attach to under the hood... shown in this wiring diagram

red71cheyenne · 05-27-2010, 03:50 PM

Quote:

Originally Posted by THENEWMEXICAN

obviously mine doesn't work cause nothing is plugged into it...

and even if it was, I'm missing the "Backing lp. sw. conn" that the LG and DG wires attach to under the hood... shown in this wiring diagram

Yep, I hear ya. I don't have any wires on mine either, but I did do a tranny swap. Yours should be there unless you converted too, or are like me and just removed them and forgot...

red71cheyenne · 05-31-2010, 05:54 PM

Ok, I figured it out. First found the connector from the neutral safety switch, this is the connection that goes to the back up lights:

red71cheyenne · 05-31-2010, 05:55 PM

Then jumpered it to the tranny connection to see if it worked. At first it didn't, the fuse was no good in the fuse box. After the fuse was replaced, back up lights!

red71cheyenne · 05-31-2010, 05:57 PM

Then made up a harness to go from the tranny to the connector inside, and there you go.

red71cheyenne · 05-31-2010, 05:59 PM

Quote:

Originally Posted by THENEWMEXICAN

obviously mine doesn't work cause nothing is plugged into it...

and even if it was, I'm missing the "Backing lp. sw. conn" that the LG and DG wires attach to under the hood... shown in this wiring diagram

By the way, the connector in my first pic is the one that goes on your neutral safety switch there. Its not under the hood.

Chulisohombre · 04-21-2015, 12:59 PM

I'm going to need to figure mine out as well. Pretty sure my trans switch is broken I had it plugged in two clutches ago and never worked and left it off. I was just planning on a toggle switch but would love to get it working correctly again. Have to get it inspected for real this year. Used to have a lick and stick Place but they went out of business s few years ago.

05-25-2010, 09:21 PM	#1
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Back up light switch Hey all, I know my backup light switch is on the tranny, but I don't know where the wires go from there. I also can't find the wires. Does someone have any pics of where the wires start and end? Thanks in advance. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

05-25-2010, 10:10 PM	#2
BLUE THUNDER Registered User Join Date: May 2007 Location: San Antonio Posts: 993	Re: Back up light switch Mine don't work either. Please post some pics.

05-25-2010, 10:17 PM	#3
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Re: Back up light switch What year tranny? Should be on the column.... 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

05-25-2010, 11:23 PM	#5
BLUE THUNDER Registered User Join Date: May 2007 Location: San Antonio Posts: 993	Re: Back up light switch Thats where mine is. Are they cheap?

05-26-2010, 02:19 AM	#6
addicted2dunes Insane In The Membrane Join Date: Jan 2010 Location: Orcutt, CA Posts: 446	Re: Back up light switch Pretty reasonable.... $15-25 __________________ Cameron Gunlock Project: ALTER-K-TION ('57 GMC Quad Cab) http://67-72chevytrucks.com/vboard/s...d.php?t=393750

05-26-2010, 02:20 AM	#7
addicted2dunes Insane In The Membrane Join Date: Jan 2010 Location: Orcutt, CA Posts: 446	Re: Back up light switch $13 at AutoZone __________________ Cameron Gunlock Project: ALTER-K-TION ('57 GMC Quad Cab) http://67-72chevytrucks.com/vboard/s...d.php?t=393750

05-26-2010, 03:17 PM	#8
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Back up light switch This is for standard transmission, not automatic. There is a switch on the side of the SM465 for the wires, but not sure where they go to from there. Anyone? __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

05-26-2010, 08:09 PM	#9
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: Back up light switch One of the wires from the switch on the SM465 goes to battery power (keyed). The other goes to the lights. When the tranny is shifted into reverse, the switch is closed, sending juice to the lights.

05-27-2010, 01:01 PM	#11
THENEWMEXICAN Registered User Join Date: Feb 2010 Location: Albuquerque NM Posts: 28	Re: Back up light switch obviously mine doesn't work cause nothing is plugged into it... and even if it was, I'm missing the "Backing lp. sw. conn" that the LG and DG wires attach to under the hood... shown in this wiring diagram

05-31-2010, 05:54 PM	#13
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Back up light switch Ok, I figured it out. First found the connector from the neutral safety switch, this is the connection that goes to the back up lights: Attached Images __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

05-31-2010, 05:55 PM	#14
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Back up light switch Then jumpered it to the tranny connection to see if it worked. At first it didn't, the fuse was no good in the fuse box. After the fuse was replaced, back up lights! Attached Images __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

05-31-2010, 05:57 PM	#15
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Back up light switch Then made up a harness to go from the tranny to the connector inside, and there you go. Attached Images __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

04-21-2015, 12:59 PM	#17
Chulisohombre Registered User Join Date: Sep 2013 Location: Bangor pa Posts: 1,223	Re: Back up light switch I'm going to need to figure mine out as well. Pretty sure my trans switch is broken I had it plugged in two clutches ago and never worked and left it off. I was just planning on a toggle switch but would love to get it working correctly again. Have to get it inspected for real this year. Used to have a lick and stick Place but they went out of business s few years ago. __________________ 72 3/4 ton blazer. 5 inch lift on 35 inch tires. 355 corvette engine with crane roller rockers, rv cam, edelbrock carb and intake with one inch spacer. Thrush Headers with flowmaster 40 duels. 4speed sm465 manual. 4 wheel disk brakes with Inboarded rear shock prerunner style mounts and shocks.



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