Backup light switch, column mounted,1980 3ott - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C10wip · 02-02-2014, 02:42 PM

My backup lights won't come on, and I have traced to it to backup light switch. This is a 3 spd, 3ott and the switch is mounted on the column by the firewall, and there is no transmission mounted switch. The circuit not including the switch is fine; if you jumper the connector the lights come on.
The switch does not seem adjustable as there are tabs which fit into the slot on the column and hold it in position. With the switch out I can feel the plates come across as I move the shifter so that seems OK. However, with the switch installed, it feels like the plates are riding up over the sliding part of the switch and not moving it ( can feel a "clunk" ). The switch is OK electrically and works if you push the slider over by hand, although it is stiff; tired lubing it a bit with silicone and that did not seem to help much. So, I figure the switch is just clapped out mechanically and I want to replace it but I can't find the part - I have looked at all of the usual suspects and only thing that looks like it is LMC part number 36-0665 - which says "is not available at this time".
Does anyone have a GM part number or knows who carries these?

Thanks.

**old Rusty C10** · 02-02-2014, 05:03 PM

see if there is a part number on there and google it then you can search auto parts stores to see if they can find it.... that's how I do it with the parts for mine GM Parts direct and Napa seem to have the most for these old trucks although GM Parts direct is pricey on shipping

mrolds88 · 02-02-2014, 05:09 PM

Why not disassemble it and clean and relube? Also is there any bushings that could wear out causing the shift tubes to misalign enough to skip on the tang?

C10wip · 02-02-2014, 05:41 PM

It says "BETA 2" at the top in the photo, but nothing else so there's no part number; it looks more like an aftermarket part. I did take it apart, clean it and work it back and forth but it didn't seem to help much. The sliding tab seems to cock sideways just a little which may be the problem. I may have to try that again though.

**old Rusty C10** · 02-02-2014, 06:33 PM

is this it? http://www.ebay.com/itm/NOS-1979-198...item2c7ba15d30

Luckilly im bored today and have time to play on the interwebs

search the web with the part number on there and youll get multiple hits

C10wip · 02-02-2014, 07:36 PM

Excellent work, detective! That sure looks like it. I see from some of the google hits that it's a discontinued part as well.
Thanks!

mrolds88 · 02-03-2014, 12:31 AM

For that kind of price I say go for it!!!

C10wip · 02-04-2014, 12:30 AM

That's what I thought - so I went after it and the price got up to $22.50 and I was losing - but there was another one for $20 and Buy It Now so I bought that one. Hopefully this will fix the problem; this is the last thing I need to fix to get it inspected.
Having a "14" on the windshield registration sticker and and "8" on the inspection sticker is a nice classic truck touch though. I usually push my luck for a month or two but 6 years may be a bit too far.

C10wip · 02-04-2014, 01:09 AM

Sorry, forgot to add - in case that ebay link goes bad some day - the GM part number is 329816 , Backup Lamp Switch ( not Backup Light Switch like I kept looking for...)

Leeforbes · 03-25-2015, 11:41 AM

found the switch for sale new online for my 1966 3-speed column shift:
http://www.classiccarautoparts.com/c..._exterior.html

$20 shipped!

02-02-2014, 02:42 PM	#1
C10wip Registered User Join Date: Nov 2013 Location: College Station, TX Posts: 72	Backup light switch, column mounted,1980 3ott My backup lights won't come on, and I have traced to it to backup light switch. This is a 3 spd, 3ott and the switch is mounted on the column by the firewall, and there is no transmission mounted switch. The circuit not including the switch is fine; if you jumper the connector the lights come on. The switch does not seem adjustable as there are tabs which fit into the slot on the column and hold it in position. With the switch out I can feel the plates come across as I move the shifter so that seems OK. However, with the switch installed, it feels like the plates are riding up over the sliding part of the switch and not moving it ( can feel a "clunk" ). The switch is OK electrically and works if you push the slider over by hand, although it is stiff; tired lubing it a bit with silicone and that did not seem to help much. So, I figure the switch is just clapped out mechanically and I want to replace it but I can't find the part - I have looked at all of the usual suspects and only thing that looks like it is LMC part number 36-0665 - which says "is not available at this time". Does anyone have a GM part number or knows who carries these? Thanks. Attached Images __________________ 1980 C10 Custom Deluxe, 250 L6, 3 in the tree.

02-02-2014, 05:03 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: Backup light switch, column mounted,1980 3ott see if there is a part number on there and google it then you can search auto parts stores to see if they can find it.... that's how I do it with the parts for mine GM Parts direct and Napa seem to have the most for these old trucks although GM Parts direct is pricey on shipping __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-02-2014, 05:09 PM	#3
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: Backup light switch, column mounted,1980 3ott Why not disassemble it and clean and relube? Also is there any bushings that could wear out causing the shift tubes to misalign enough to skip on the tang? __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

02-02-2014, 05:41 PM	#4
C10wip Registered User Join Date: Nov 2013 Location: College Station, TX Posts: 72	Re: Backup light switch, column mounted,1980 3ott It says "BETA 2" at the top in the photo, but nothing else so there's no part number; it looks more like an aftermarket part. I did take it apart, clean it and work it back and forth but it didn't seem to help much. The sliding tab seems to cock sideways just a little which may be the problem. I may have to try that again though. __________________ 1980 C10 Custom Deluxe, 250 L6, 3 in the tree.

02-02-2014, 06:33 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: Backup light switch, column mounted,1980 3ott is this it? http://www.ebay.com/itm/NOS-1979-198...item2c7ba15d30 Luckilly im bored today and have time to play on the interwebs search the web with the part number on there and youll get multiple hits __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-02-2014, 07:36 PM	#6
C10wip Registered User Join Date: Nov 2013 Location: College Station, TX Posts: 72	Re: Backup light switch, column mounted,1980 3ott Excellent work, detective! That sure looks like it. I see from some of the google hits that it's a discontinued part as well. Thanks! __________________ 1980 C10 Custom Deluxe, 250 L6, 3 in the tree.

02-03-2014, 12:31 AM	#7
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: Backup light switch, column mounted,1980 3ott For that kind of price I say go for it!!! __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

02-04-2014, 12:30 AM	#8
C10wip Registered User Join Date: Nov 2013 Location: College Station, TX Posts: 72	Re: Backup light switch, column mounted,1980 3ott That's what I thought - so I went after it and the price got up to $22.50 and I was losing - but there was another one for $20 and Buy It Now so I bought that one. Hopefully this will fix the problem; this is the last thing I need to fix to get it inspected. Having a "14" on the windshield registration sticker and and "8" on the inspection sticker is a nice classic truck touch though. I usually push my luck for a month or two but 6 years may be a bit too far. __________________ 1980 C10 Custom Deluxe, 250 L6, 3 in the tree.

02-04-2014, 01:09 AM	#9
C10wip Registered User Join Date: Nov 2013 Location: College Station, TX Posts: 72	Re: Backup light switch, column mounted,1980 3ott Sorry, forgot to add - in case that ebay link goes bad some day - the GM part number is 329816 , Backup Lamp Switch ( not Backup Light Switch like I kept looking for...) __________________ 1980 C10 Custom Deluxe, 250 L6, 3 in the tree.

03-25-2015, 11:41 AM	#10
Leeforbes Registered User Join Date: Jan 2015 Location: Bradenton, FL Posts: 38	Re: Backup light switch, column mounted,1980 3ott found the switch for sale new online for my 1966 3-speed column shift: http://www.classiccarautoparts.com/c..._exterior.html $20 shipped!



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