looking for rear taillight wiring harness - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blazer2007 · 03-28-2014, 09:57 AM

I,m looking for wiring harness just from the rear lights up to the cab but don,t see any in my catolugue for a 78 Does any vendor sell them or should I just make my own?

silverbear · 03-28-2014, 09:05 PM

Senior member "hatzie" has a link to several manuals in his signature. Do a search for him and then look up your truck in the links.

mikentosh · 03-29-2014, 10:00 AM

Check with M&H Electric. They should have what you are looking for. It might take a bit of time to build you one but their quality is worth it.

**hatzie** · 03-29-2014, 01:13 PM

This guy makes them.
http://www.mrtaillight.com/product_i...roducts_id=673
Just looking at the picture...

Grounding wires??? I don't see the factory ring terminal grounds that go behind the tailights and I also don't see more than 4 wires at the unterminated tailight to main harness tails.
The 1156/1157/194 bulb sockets are overmolded on the harness instead of the factory style sockets. The overmolds will probably hold up for several years but I'm not sure how well they'll work in another 20.
The license plate light connectors look like unsealed 1/4 disconnects. This is not the place to have un-sealed connectors. Single or two position Weatherpaks are what I would use. You can probably request those or trailer style bullet overmolds.
No molded connector to mate with the 1978 OEM harness. Not neccesarily a negative. You can probably request the 85-91 Delphi Weatherpak 2x2 connector 12015798 on his harness and install the Delphi Weatherpak 12015024 mating half on yours in place of the 73-84 overmolded GM connector... or just install your own Weatherpacks.

I've done this connector update several times. Mouser Electronics has a nice little feature called projects that allows you to save a Bill of Materials for a project and then share it with anyone. I put all the pieces to assemble male and female Delphi Weatherpak 2x2 connectors together so I could order them or share a BOM with descriptions and OEM part #s.
This link ---> will take you directly to my Mouser Electronics Delphi Weatherpak 2x2 4 position connectors, terminals, and seals "saved project".

GM Circuit #s
# 9 Running Lamps
# 18 LH Turn
# 19 RH Turn
# 24 Backup Lamps
Wiring diagram follows. More info in this thread -->http://67-72chevytrucks.com/vboard/s...d.php?t=612960

mustardrocket · 03-29-2014, 10:15 PM

I decided to order one of the rear tail light wiring harnesses. I had been having taillight issues for years. I'm not much for wiring, but I should be able to adapt weather tight plugins. I'll post on it when installed.

03-28-2014, 09:57 AM	#1
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	looking for rear taillight wiring harness I,m looking for wiring harness just from the rear lights up to the cab but don,t see any in my catolugue for a 78 Does any vendor sell them or should I just make my own? Last edited by old Rusty C10; 03-28-2014 at 09:19 PM.

03-28-2014, 09:05 PM	#2
silverbear Registered User Join Date: Feb 2014 Location: Glen St. Mary, Florida Posts: 304	Re: looking for rear taillight wiring harness Senior member "hatzie" has a link to several manuals in his signature. Do a search for him and then look up your truck in the links. __________________ 86 Chevrolet K10 350/SM465 Frankie SOLD 1995 GMC Yukon GT SOLD 1996 GMC Yukon GT 2010 Suburban 1500 4x4 5.3l/6L80e. Sold 2016 Silverado 2500HD Crew Cab 4x4 6.0l/6L80e

03-29-2014, 10:00 AM	#3
mikentosh Registered User Join Date: Sep 2013 Location: San Jose, CA Posts: 406	Re: looking for rear taillight wiring harness Check with M&H Electric. They should have what you are looking for. It might take a bit of time to build you one but their quality is worth it.

03-29-2014, 01:13 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,941	Re: looking for rear taillight wiring harness This guy makes them. http://www.mrtaillight.com/product_i...roducts_id=673 Just looking at the picture... Grounding wires??? I don't see the factory ring terminal grounds that go behind the tailights and I also don't see more than 4 wires at the unterminated tailight to main harness tails. The 1156/1157/194 bulb sockets are overmolded on the harness instead of the factory style sockets. The overmolds will probably hold up for several years but I'm not sure how well they'll work in another 20. The license plate light connectors look like unsealed 1/4 disconnects. This is not the place to have un-sealed connectors. Single or two position Weatherpaks are what I would use. You can probably request those or trailer style bullet overmolds. No molded connector to mate with the 1978 OEM harness. Not neccesarily a negative. You can probably request the 85-91 Delphi Weatherpak 2x2 connector 12015798 on his harness and install the Delphi Weatherpak 12015024 mating half on yours in place of the 73-84 overmolded GM connector... or just install your own Weatherpacks. I've done this connector update several times. Mouser Electronics has a nice little feature called projects that allows you to save a Bill of Materials for a project and then share it with anyone. I put all the pieces to assemble male and female Delphi Weatherpak 2x2 connectors together so I could order them or share a BOM with descriptions and OEM part #s. This link ---> will take you directly to my Mouser Electronics Delphi Weatherpak 2x2 4 position connectors, terminals, and seals "saved project". GM Circuit #s # 9 Running Lamps # 18 LH Turn # 19 RH Turn # 24 Backup Lamps Wiring diagram follows. More info in this thread -->http://67-72chevytrucks.com/vboard/s...d.php?t=612960 __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

03-29-2014, 10:15 PM	#5
mustardrocket Registered User Join Date: Nov 2013 Location: NY NY Posts: 11	Re: looking for rear taillight wiring harness I decided to order one of the rear tail light wiring harnesses. I had been having taillight issues for years. I'm not much for wiring, but I should be able to adapt weather tight plugins. I'll post on it when installed.



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