The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-20-2014, 03:29 PM   #1
67JimmyMO
Registered User
 
67JimmyMO's Avatar
 
Join Date: Jun 2014
Location: Southwest MO
Posts: 115
67 GMC SWB-License Plate Light Wiring?

Anyone know how (or if?) the license plate light wire is supposed to tie in to the taillight wiring harness?

I have the flat 4-wire lead running back the driver's side frame rail to the plug behind the rear axle, then it splits to go to each taillight...but I don't see anywhere to plug in the license plate light.

Here is a pic of the light, and of the pigtail/plug end that is coming off of the light.
Attached Images
  
__________________
1967 GMC SWB 383 Stroker w/Saginaw 4sp
1979 Chev C30 Scottsdale Flatbed 350 4sp
2000 Chev 3500 Flatbed 454 Automatic
1978 GMC 6500 Flatbed Dump 366 5sp + 2sp
1965 Chev K10 LWB 230 4sp
1985 Chev K30 Flatbed 350 4sp
67JimmyMO is offline   Reply With Quote
Old 10-20-2014, 03:53 PM   #2
Sammy
Registered User
 
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
Re: 67 GMC SWB-License Plate Light Wiring?

Looked at the Assy manual. Says BRN. tracing it shows spliced to the marker lights.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL"


"You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig."

ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"
Sammy is offline   Reply With Quote
Old 10-20-2014, 04:01 PM   #3
67JimmyMO
Registered User
 
67JimmyMO's Avatar
 
Join Date: Jun 2014
Location: Southwest MO
Posts: 115
Re: 67 GMC SWB-License Plate Light Wiring?

Quote:
Originally Posted by Sammy View Post
Looked at the Assy manual. Says BRN. tracing it shows spliced to the marker lights.
Thanks for that Sammy, but this truck has no marker lights. Did any 67s have them?
__________________
1967 GMC SWB 383 Stroker w/Saginaw 4sp
1979 Chev C30 Scottsdale Flatbed 350 4sp
2000 Chev 3500 Flatbed 454 Automatic
1978 GMC 6500 Flatbed Dump 366 5sp + 2sp
1965 Chev K10 LWB 230 4sp
1985 Chev K30 Flatbed 350 4sp
67JimmyMO is offline   Reply With Quote
Old 10-20-2014, 04:02 PM   #4
Sammy
Registered User
 
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
Re: 67 GMC SWB-License Plate Light Wiring?

I assume since you don't have marker lights the brown from the RR or LR tail light are also spliced in the same harness. Yellow/green/ Lt Green are backup n brakes.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL"


"You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig."

ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"
Sammy is offline   Reply With Quote
Old 10-20-2014, 04:05 PM   #5
Sammy
Registered User
 
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
Re: 67 GMC SWB-License Plate Light Wiring?

I realized that I was looking at a 71 chart. It shows black lead from your Lic bulb to brown traced to a brown splice which also feeds your tail lights. Yeah, I never hook up my lic plate lights as long as the police don't bug me.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL"


"You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig."

ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"
Sammy is offline   Reply With Quote
Old 10-20-2014, 04:09 PM   #6
Sammy
Registered User
 
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
Re: 67 GMC SWB-License Plate Light Wiring?

Look for the brown n tie in there trace it make sure that brown feeds both tails you should be good. Stay away from the other colors..
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL"


"You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig."

ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"
Sammy is offline   Reply With Quote
Old 10-20-2014, 04:13 PM   #7
67JimmyMO
Registered User
 
67JimmyMO's Avatar
 
Join Date: Jun 2014
Location: Southwest MO
Posts: 115
Re: 67 GMC SWB-License Plate Light Wiring?

Quote:
Originally Posted by Sammy View Post
Look for the brown n tie in there trace it make sure that brown feeds both tails you should be good. Stay away from the other colors..
Sounds good, will do. I was hoping I wouldn't have to cut in to the harness but not a big deal.

The last time I got stopped by the local authorities (different truck, years ago) it was for an...unlit license plate light.
__________________
1967 GMC SWB 383 Stroker w/Saginaw 4sp
1979 Chev C30 Scottsdale Flatbed 350 4sp
2000 Chev 3500 Flatbed 454 Automatic
1978 GMC 6500 Flatbed Dump 366 5sp + 2sp
1965 Chev K10 LWB 230 4sp
1985 Chev K30 Flatbed 350 4sp
67JimmyMO is offline   Reply With Quote
Old 10-20-2014, 04:27 PM   #8
Sammy
Registered User
 
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
Re: 67 GMC SWB-License Plate Light Wiring?

Checked my 69 it has reflector markers no bulbs. Confirms usage of the brown. Different style of light I have for the step bumper.
Attached Images
  
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL"


"You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig."

ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"
Sammy is offline   Reply With Quote
Old 10-20-2014, 05:30 PM   #9
67JimmyMO
Registered User
 
67JimmyMO's Avatar
 
Join Date: Jun 2014
Location: Southwest MO
Posts: 115
Re: 67 GMC SWB-License Plate Light Wiring?

Maybe this bumper was installed later and never hooked in?

Were the bumpers commonly or typically installed by the dealers on these trucks?

Not sure if my bumper is original but it is definitely old...the license plate light lens has a Guide 67 on it.
__________________
1967 GMC SWB 383 Stroker w/Saginaw 4sp
1979 Chev C30 Scottsdale Flatbed 350 4sp
2000 Chev 3500 Flatbed 454 Automatic
1978 GMC 6500 Flatbed Dump 366 5sp + 2sp
1965 Chev K10 LWB 230 4sp
1985 Chev K30 Flatbed 350 4sp
67JimmyMO is offline   Reply With Quote
Old 10-20-2014, 08:01 PM   #10
Sammy
Registered User
 
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
Re: 67 GMC SWB-License Plate Light Wiring?

Mostly a dealer installed. But when my Dad bought his 69 they wanted $24 to install a $35 bumper. My Dad just had them put it in bed.
On the 67/68's over the years I have seen maybe eight or more different style step bumpers for fleet bed trucks. Narrow, wide, sorta wrap around, even thicker, some with the dealer name n City welded onto the face. So being a dealer installed item just about anything could have been installed.
__________________
'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL"


"You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig."

ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"
Sammy is offline   Reply With Quote
Old 10-20-2014, 08:11 PM   #11
Andy4639
Old member
 
Andy4639's Avatar
 
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
Wink Re: 67 GMC SWB-License Plate Light Wiring?

Easy way to hook it up is take connector loose at rear end and put a 12 volt test light on the connections with the parking lights on only. Which ever connector lights up the test light you just found the wire to hook to. 40+ year old trucks owned by several others who may are may not of cared what color wire they used.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver
Seeing the USA in a 71


Upstate SC GM Truck Club
2013,14 and 2016 Hot Rod Pour Tour


http://upstategmtrucks.com/



Get out and drive the truck this summer and have some fun!
It sucks not being able to hear!

LWB trucks rule, if you don't think so measure your SWB!
After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.
Andy4639 is offline   Reply With Quote
Old 10-21-2014, 01:42 AM   #12
A.Bursell
Registered User
 
Join Date: Jul 2012
Location: Marysville, WA
Posts: 298
Re: 67 GMC SWB-License Plate Light Wiring?

There should be some piece of the original brown wire coming from the left taillight. I think most connectors were cut when an aftermarket step bumper was installed, as the factory "no-bumper" light would plug in, as well as a factory bumper light.

Once you know you have a piece of the brown wire, next step is a little bit of luck. Go to the junkyard and look for a 70's-80's van (73+ pickups will not work). They will have the same brown wire with same connector for license plate light and you will be able to cut it off back far enough to have enough wire so you can splice it back over to lead coming from your taillight.

Do a nice splice with heat shrink and you will be good as new.

Adam
A.Bursell is offline   Reply With Quote
Old 10-21-2014, 02:27 AM   #13
67chevy1series
Registered User
 
67chevy1series's Avatar
 
Join Date: Mar 2010
Location: a t w a t e r cali 95301
Posts: 10,713
Re: 67 GMC SWB-License Plate Light Wiring?

On my original 67 rear tail light wiring harness the license plate light is tied into the driver taillight wire, and judging by how the license plate light only comes on when you turn on your running lights or both headlights and taillights it's in the wiring for the taillight portion only, not the brake or turn signal wire (I forgot which color wire it is... Sorry)
67chevy1series is offline   Reply With Quote
Old 10-21-2014, 06:24 AM   #14
67JimmyMO
Registered User
 
67JimmyMO's Avatar
 
Join Date: Jun 2014
Location: Southwest MO
Posts: 115
Re: 67 GMC SWB-License Plate Light Wiring?

Quote:
Originally Posted by A.Bursell View Post
There should be some piece of the original brown wire coming from the left taillight. I think most connectors were cut when an aftermarket step bumper was installed, as the factory "no-bumper" light would plug in, as well as a factory bumper light.

Once you know you have a piece of the brown wire, next step is a little bit of luck. Go to the junkyard and look for a 70's-80's van (73+ pickups will not work). They will have the same brown wire with same connector for license plate light and you will be able to cut it off back far enough to have enough wire so you can splice it back over to lead coming from your taillight.

Do a nice splice with heat shrink and you will be good as new.

Adam
I will see if I have an existing piece of brown wire coming off the left side, and great info on the 70s-80s van as to where where to find the right connector to match my existing, thanks.

This license light connection is the first instance I've found of any wiring that is missing/cut/unconnected on this whole truck, everything else appears virtually untouched.

Thanks to everyone for their input, much appreciated!
__________________
1967 GMC SWB 383 Stroker w/Saginaw 4sp
1979 Chev C30 Scottsdale Flatbed 350 4sp
2000 Chev 3500 Flatbed 454 Automatic
1978 GMC 6500 Flatbed Dump 366 5sp + 2sp
1965 Chev K10 LWB 230 4sp
1985 Chev K30 Flatbed 350 4sp
67JimmyMO is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:54 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com