![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
GMC front parking light socket
Is the front parking light socket on my 65 GMC a standard 1157? As nice as the original wiring is in my truck, the previous owner has done some interesting modification and wiring to the hood light harness and sockets. Just looking to replace the sockets with fresh new ones as they are rather tired. And also - those are not turn signal but just running lights - correct?
|
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jun 2013
Location: joshua tree ca.
Posts: 1,484
|
Re: GMC front parking light socket
1157/1034 correct and both park and turn
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
Re: GMC front parking light socket
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
Re: GMC front parking light socket
In terms of wiring - any pics on that harness and grounding?
Last edited by BigSix; 01-28-2016 at 12:45 PM. |
![]() |
![]() |
![]() |
#5 | |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
|
Re: GMC front parking light socket
Quote:
This harness doesn't contain any ground wires. The sockets are grounded through the metal reflector/housings of the light assemblies. So make sure the holes that the sockets snap into are clean & free of corrosion. Also make sure the light housings are making good electrical contact with the hood since that's part of the ground path as well. |
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
Re: GMC front parking light socket
So I'm getting zero current to the firewall connector where the harness plugs. Where does that connector draw power from - could I have unplugged it from the fuse box in any way? Headlights and tail lights work and horn is super weak but when I attached horn to battery it was strong. Could my issue be the horn relay?
|
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
|
Re: GMC front parking light socket
There are 3 wires/circuits in this harness & the section of the firewall connector it plugs into.
(1) The parking light circuit (purple wire on Chevy, not sure if GMC is the same) is fed directly off the headlight switch. This circuit will only be live with the headlight switch knob pulled out to the first detent. The parking lights in these years go back out again when you pull the knob all the way out to the headlights on position. (2 & 3) The turn signal light circuits (light blue left, dark blue right) are fed directly off the turn signal switch. And the feeds to the front are separate from the rear since the rear turn signals use the same bulb filaments as the brake lights. Power into the switch is routed through the turn signal flasher. Yes, bad contacts inside the horn relay could be preventing the horn from receiving full power and making it sound weak. Could also be a poor connection in the wiring between the relay & horn or in the feed wire leading to the horn relay. |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
Re: GMC front parking light socket
What is strange is that I cannot get any power out of the parking light/turn signal wires. Headlights work, dimmer switch works, but I cannot get parking lights or turn signals to work. Could my issue be in the steering column with the turn signals and that is also killing the parking lights?
|
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Oct 2015
Location: Hampshire, UK
Posts: 182
|
Re: GMC front parking light socket
I've just been through all of this connecting my parking lights and turn signals as the previous owner ripped everything off.
I used a motorbike turn signal to test it out, which connector did what, not sure if yours looks the same as mine though I followed the diagram and put a spade connector on the plug in the engine bay and got front turn signals working! (again using the bike light) So on that photo, where the blade is connected turns the left turn signal on (flashing) the one above turns the right turn signal on and the one to the left of that blade connector turns them steady - parking lights, which is the first stop when pulling the lights switch, goes off once i pull another stop which turns headlights on ![]() all i done was one wire to the blade connector, the other wire to ground
__________________
My 65 stepside build/work on thread - http://67-72chevytrucks.com/vboard/s...d.php?t=693138 |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
Re: GMC front parking light socket
Sorry what did you do to fix it? Thus far, using a test light, grounding to the block, I cannot get any of the 3 spaces on the firewall connector to turn on my test light. Somehow power is not making it to those 3 wires.
|
![]() |
![]() |
![]() |
#11 | |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
|
Re: GMC front parking light socket
Quote:
Just in case it's a different color in your GMC vs. Chevy, the parking light wire should be the one leading to "terminal #7" in this diagram: That diagram is for the later years that keep the parking lights on with the headlights so that terminal is missing from the switch pictured. If you have power there, but not out at the firewall connector, check for a break somewhere in the purple wire between the headlight switch & firewall connector. But if you don't have any power on that headlight switch terminal then you likely have a bad headlight switch or bad power feed to the switch. You mentioned that the headlights do work so I think you can rule out a bad power feed since the parking lights in these years operate off the same feed as the headlights. Similarly, for the turn signals, use your test light to check for power on the light & dark blue wires on the turn signal switch connector near the steering column. If you have power at the switch, but not out at the firewall connector, check for broken damaged wires between the switch & firewall connector. However, if there is no power on the light & dark blue wires directly at the turn signal switch, check for power on the purple wire. That's the feed from the turn signal flasher. If that doesn't have power, check the flasher & fuse. Note that the turn signal circuit is only powered with the key on. |
|
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
|
Re: GMC front parking light socket
Thank you!
|
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|