Tail light harness (under dash) questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VA72C10 · 08-11-2010, 01:50 PM

The lights are all run and grounded, turned on the switch and front and front sidemarkers work perfect...rears no go...

..so...I look under the truck and trace the wires from back to front with no breaks/chafing/etc... all the way to the firewall...

look under the dash and

Doh...nothing's plugged into the connector. I don't have any more wiring for the truck (bought as a project) but I do have a couple boxes full of generic harnesses in my garage....

...so I guess what I'm asking is what am I looking for? I know it will have the round four prong connector to the end, but what else is on that wiring harness? Everything else works inside and out....where does the other end plug other than to the fuse panel I would have to assume??? I never paid attention disconnecting my other project and got this one the way it is now.....

any help is appreciated...I did search here and FAQ's

Long story short....I need to know what plugs into the round four prong connector that is through the firewall (plugs under the dash above and to the right of the gas pedal)....and where the other end of that plugs into the fuse panel. Thanks.

VA72C10 · 08-11-2010, 05:04 PM

ttt.....need to fix by saturday to drive legally to a show

thanks...

VA72C10 · 08-11-2010, 10:12 PM

bump for the evening crowd...

VA72C10 · 08-12-2010, 01:03 AM

Wiring I'm looking for is what attaches to this set of wires that come in from the firewall (female end under the dash....)

fixit-p · 08-12-2010, 01:22 AM

Yellow and dark green wires go to the turn signal connector at the base of the steering column.

Brown wire goes to the light switch.

Light green wire goes to back up switch

VA72C10 · 08-12-2010, 09:05 AM

Thanks. I'll look through my harnesses to see if I can find one that looks correct. If not I will make it from scratch going off your list. Thanks again.

VA72C10 · 08-13-2010, 12:17 AM

Thankfully the harness was there the whole time....just tucked up and zip tied I assume until the PO had the rear lights and grounds installed....
here's a picture of it installed for future reference of others.....

pat 70/71 · 08-13-2010, 09:36 AM

I had this happen to my truck . when I connected the middle wiring harness at the cab somehow I pushed one of the pins out of the connecter (dash side) so , check that all the pins are in the proper location. hope this helps, Pat

08-11-2010, 01:50 PM	#1
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Tail light harness (under dash) questions The lights are all run and grounded, turned on the switch and front and front sidemarkers work perfect...rears no go... ..so...I look under the truck and trace the wires from back to front with no breaks/chafing/etc... all the way to the firewall... look under the dash and Doh...nothing's plugged into the connector. I don't have any more wiring for the truck (bought as a project) but I do have a couple boxes full of generic harnesses in my garage.... ...so I guess what I'm asking is what am I looking for? I know it will have the round four prong connector to the end, but what else is on that wiring harness? Everything else works inside and out....where does the other end plug other than to the fuse panel I would have to assume??? I never paid attention disconnecting my other project and got this one the way it is now..... any help is appreciated...I did search here and FAQ's Long story short....I need to know what plugs into the round four prong connector that is through the firewall (plugs under the dash above and to the right of the gas pedal)....and where the other end of that plugs into the fuse panel. Thanks. __________________ Looking for a 67-72 swb or blazer project in or around VA.

08-11-2010, 05:04 PM	#2
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Re: Tail light harness (under dash) questions ttt.....need to fix by saturday to drive legally to a show thanks... __________________ Looking for a 67-72 swb or blazer project in or around VA.

08-11-2010, 10:12 PM	#3
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Re: Tail light harness (under dash) questions bump for the evening crowd... __________________ Looking for a 67-72 swb or blazer project in or around VA.

08-12-2010, 01:03 AM	#4
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Re: Tail light harness (under dash) questions Wiring I'm looking for is what attaches to this set of wires that come in from the firewall (female end under the dash....) __________________ Looking for a 67-72 swb or blazer project in or around VA.

08-12-2010, 09:05 AM	#6
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Re: Tail light harness (under dash) questions Thanks. I'll look through my harnesses to see if I can find one that looks correct. If not I will make it from scratch going off your list. Thanks again. __________________ Looking for a 67-72 swb or blazer project in or around VA.

08-13-2010, 12:17 AM	#7
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Re: Tail light harness (under dash) questions Thankfully the harness was there the whole time....just tucked up and zip tied I assume until the PO had the rear lights and grounds installed.... here's a picture of it installed for future reference of others..... __________________ Looking for a 67-72 swb or blazer project in or around VA.

08-13-2010, 09:36 AM	#8
pat 70/71 Registered User Join Date: Nov 2009 Location: newbury park california Posts: 1,038	Re: Tail light harness (under dash) questions I had this happen to my truck . when I connected the middle wiring harness at the cab somehow I pushed one of the pins out of the connecter (dash side) so , check that all the pins are in the proper location. hope this helps, Pat Last edited by pat 70/71; 08-13-2010 at 09:39 AM.



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