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#1 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Backup Light Switch Pigtail?
Hello everyone, you guys are always a wealth of knowledge and hep so I’ve got another one for you.
I’m looking for the pigtail for the trans mounted backup light switch. My plans were to make my own but the spades are not typical, slightly oversized. Wires are ran, circuit is tested, and I don’t want to solder it and add another connector if I can keep from it. My local parts house is no help and my google-ese is lacking!
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Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#2 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Backup Light Switch Pigtail?
What size are the terminals on that switch?
If they're not any wider than 1/4", it looks like it would accept Packard/Delphi (now Aptiv) 56-series female terminals in a #2973781 connector. Although given the location, the original was probably a sealed rubber connector. |
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#3 | |
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Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
Quote:
The connector you reference looks like a “T” connector rather than the “L” it needs but I can’t find a very good picture to confirm.
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Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#4 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Backup Light Switch Pigtail?
Hmmm ... that seems strange that the terminals are just over 1/4". The next size up from the 56 series are the 59 series terminals that are commonly used on things like headlights but those are 5/16" wide and might be too big. Even in the newer Metri-Pack terminals they have the 630 series (6.3mm, just a whisker under quarter inch) and 800 series (8mm, 5/16").
The switch appears to be a new one. Do you still have the old one for comparison? I'm wondering if the wider terminals are a manufacturing variation with the new switch. In which case you might have to consider carefully modifying them with a file or Dremel tool to accept standard 1/4" connectors. The #2973781 connector is sort of a cross between a "T" and an "L". Attached is an end view of one. I think this is the correct configuration for your switch but it's hard to tell for sure just going by a picture. |
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#5 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
Thanks for the valuable input so far.
I do have the old one but the pins were sheared off some time ago, by someone else! I like the file idea, then I can build my own pigtail and be done with it.
__________________
Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#6 |
Registered User
Join Date: May 2016
Location: Willow, Alaska
Posts: 877
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Re: Backup Light Switch Pigtail?
I’d be willing to bet you could snag one of those from the salvage yard. It’s a short little harness assembly that runs up to that plastic wire pouch and then dips down and passes through the firewall. I believe it’s a light green and dark green wires.
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#7 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
Unfortunately I don’t have one terribly close by and time is limited. It may come to that but I think I found one on eBay I may take a chance on.
__________________
Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#8 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
I found the old one and it was good enough to get some measurements from. The terminals are definitely larger, almost a 9/32”. I picked up a generic headlight pigtail from the parts store and the terminals appear to fit but the connector spacing/orientation is too far wrong to easily adapt it.
This is getting frustrating! Good thing I don’t need reverse lights. I went ahead and ordered the “correct” pigtail from the only place I could readily find one...eBay!
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Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto Last edited by wixthedog; 07-12-2020 at 09:41 PM. |
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#9 | |
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Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: Backup Light Switch Pigtail?
Quote:
Hi did you try any years of trucks/cars that this came in at one of your Scrap yard/Recycling yards, or GM Dear parts counter. Maybe good trans shop.
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![]() Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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#10 | |
Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: Backup Light Switch Pigtail?
Quote:
Hi did you try any years of trucks/cars that this came in at one of your Scrap yard/Recycling yards, or GM Dear parts counter. Maybe good trans shop.
__________________
![]() Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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#11 | |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
Quote:
I tried my local transmission shop for the speedo gear in a SM465 a while back and they just stared at me funny, blankly saying they just order that kind of stuff and not offering to help any further so I left it at that.
__________________
Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#12 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
The $11 pigtail arrived and it sure looks like the right one, by picture anyway. I’m out of town for work so my wife snapped a picture for me. She said she won’t install it...
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Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#13 |
Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: Backup Light Switch Pigtail?
That the one off e-bay?? because there is two like the I was sure needed that one Or I would have gave you a link week ago.
Sorry if that the one.
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![]() Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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#14 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Backup Light Switch Pigtail?
From the GM wiring diagrams.
The transmission switch end is Delphi Packard Aptive 2984092. It accepts Female Packard 56 terminals. This shell is obsolete. The under dash end is Delphi Packard Aptive 2973431. It accepts Male Packard 56 terminals.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#15 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
Good info, thanks. If this plug doesn’t work out that’ll help point me in another direction for sure.
__________________
Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#16 |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: Backup Light Switch Pigtail?
Another idea to keep in mind, is swapping out the entire switch. My '87 sm465 had a common two-pin weatherpack connector on that switch instead of the two blade terminals. RockAuto sells that weatherpack switch for about $10.
I can't guarantee the newer style switch would fit your older transmission, but I'd be surprised if it doesn't.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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#17 | |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
Quote:
__________________
Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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#18 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: Backup Light Switch Pigtail?
Weatherpak components used to be available at NAPA. I haven't asked there in over a decade so I can't guarantee they still sell them.
Delphi Weatherpaks are actually reasonably weathertight... vs the un-sealed Packard 56. The 2 position 12015792 Tower half, Female terminals, and wire seals are easy to find. Mouser Electronics stocks most Delphi (Aptive now) electrical connector parts and Delphi tools. There's an outfit called The Electrical Depot that sells a lot of automotive connectors in small job quantities. They stock some Delphi terminal extractor and crimp tooling at a reasonable price as well. If you don't have the skill set or the tooling or either... and don't feel like buying the tools and developing the skill set... they sell some repair pigtails.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 07-21-2020 at 01:19 PM. |
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#19 |
Registered User
![]() Join Date: Sep 2019
Location: Magnolia, TX
Posts: 225
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Re: Backup Light Switch Pigtail?
My intent is never to restore to factory as an ultimate requirement, only if its easy enough to do so.
I was thinking last night about a O2 sensor and how that could work for me if I find a generic 2-pin weatherproof connector. I can solder on the pins and heat shrink a short pigtail to End 1 of the generic connector and go from there. That would solve my requirement of having to remove or service the transmission or switch later on. This all assuming that the pigtail I received from eBay does not fit but I am still 4 weeks from knowing that... The Electric Depot is a great source, I've never used them. I typically use RS and Allied for electrical components at work.
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Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto |
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