6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > Interiors, Dash, Lights and Electrical
#Sponsored

Interiors, Dash, Lights and Electrical Everything Inside

Reply
 
Thread Tools
  #1  
Old July 23rd, 2023, 12:21 AM
Harleyq Harleyq is offline
Member
 
Join Date: Oct 2022
Location: Medford, Or.
Truck: '66 gmc pu
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 25
Harleyq is on a distinguished road
Default LED issues upon issues upon issues

Where to start...came up with the seemingly brilliant idea of changing front
turn signals and back brake/taillights over to LEDs as they are considerably brighter. However, brighter they may be but getting everything to work at the same time has turned into an excerise of futility. First try changed all the bulbs out hit the turn signal and both front came on a t same time. After scratching my head for a moment, or two, I realizes I needed resistors. To the parts store I go, got said resistors, installed and....nothing. was informed I needed another turn signal switch relay so ordered one. Recieved and installed...still nothing. During all this other issues have arised along the way. R rear parking light doesn't work, while left side the brake light stays on. Went back to original light bulbs all around. Front turn signals work as well as R rear, L is still constant brake light so really don't know if signal is working. So far with money spent on bulbs, and various accessories, I've got more problems than when I started. Money well spent right?! I have resistors in line on front but not rear as they were working with led originally. Do I need resistors in line in rear as well? And what else am I missing?? A far wiser master of wire has assisted me in non ked issues, but I'm lost on what I need to do to make these LEDs shine so bright. Any help, advice, sarcastic humor, would be appreciated. I figure I'm too far in to stop now and might as well do whatever I need too, to make them work. Thank you in advance...
Reply With Quote
  #2  
Old July 23rd, 2023, 12:31 AM
FetchMeAPepsi's Avatar
FetchMeAPepsi FetchMeAPepsi is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Edmond, Ks
Truck: 1962 4x4 GMC CECILIA
Posts: 1,780
Thanks: 19
Thanked 4 Times in 3 Posts
Rep Power: 570
FetchMeAPepsi is a glorious beacon of lightFetchMeAPepsi is a glorious beacon of lightFetchMeAPepsi is a glorious beacon of lightFetchMeAPepsi is a glorious beacon of lightFetchMeAPepsi is a glorious beacon of lightFetchMeAPepsi is a glorious beacon of light
Default Re: LED issues upon issues upon issues

I'm pretty sure you have to switch to an electronic flasher to get LEDs to work. I had to do that on my non GMC old vehicle. Worked great, cost 12 bucks. Also, LEDs only work one way. You can't have the current running the opposite direction like you can with a standard bulb.
If the bulb doesnt work, turn it around. It might work that way.
I have no idea how you got one brake light to stay on forever. That's probably just magic.
__________________
Step by steps:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
__________________
If the women don't find you handsome, they should at least find you handy.
Reply With Quote
  #3  
Old July 23rd, 2023, 02:30 PM
James James is offline
-= Extreme Supporter =-
 
Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 450
Thanks: 10
Thanked 4 Times in 3 Posts
Rep Power: 207
James will become famous soon enoughJames will become famous soon enoughJames will become famous soon enough
Default Re: LED issues upon issues upon issues

Quote:
Originally Posted by Harleyq View Post
First try changed all the bulbs out hit the turn signal and both front came on a the same time. After scratching my head for a moment, or two, I realizes I needed resistors.
Both front turn signal can turn on because they require very litttle current. The way our truck is wired, power from one turn signal light is feed thru the turn signal indicator light (from the front lights only) to the oppsite light. Adding a load resistor parallel to each bulbs will prevent this. Also without the resistors the turn signal indicator may (very dim) or may not light up. Resistors are also needed if using the OEM style flasher. The OEM flasher has a bi-metalic spring that heat up causing it to break the circuit. Like FetchMeAPepsi says, using an electronic flasher help. If using an electronic flasher you would only need the resistors on the front lights and not required for the back lights. And yes, they won't work if plug in wrong, polarity matter. Also do not use a LED turn signal indicator bulb, because of polarity it would only flash in one direction and not the other.

Truck wiring can be modifiy to do away with the resistors, but it would require to know where to modifiy and the experence in wiring to do it right.

Quote:
Originally Posted by Harleyq View Post
During all this other issues have arised along the way. R rear parking light doesn't work, while left side the brake light stays on.
This sound like a turn signal switch gone bad. This is where the magic happen, it cancel the brake light and turn on the turn signal when selecting a turn.
Reply With Quote
  #4  
Old July 24th, 2023, 11:23 AM
Harleyq Harleyq is offline
Member
 
Join Date: Oct 2022
Location: Medford, Or.
Truck: '66 gmc pu
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 25
Harleyq is on a distinguished road
Default Re: LED issues upon issues upon issues

Thanks for the advice, just what I needed was more magical mystery stuff going on but man have I got it...with headlights off I have turn signals all around, hallelujah! However, no brake lights. Now with headlights on I have front turn signals and pass side R turn signals. Driver side brake light still shining full time w/headlights. The wall next to my door to my shop has worn spot from banging my head, I love my truck, but we've got to get to an understanding about this lighting situation. Also, as if this isn't enough, I have to hold turn signal switch up or down to get them to work. I'm assuming I have a replacement in the near future....
Reply With Quote
  #5  
Old July 24th, 2023, 01:38 PM
James James is offline
-= Extreme Supporter =-
 
Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 450
Thanks: 10
Thanked 4 Times in 3 Posts
Rep Power: 207
James will become famous soon enoughJames will become famous soon enoughJames will become famous soon enough
Default Re: LED issues upon issues upon issues

Quote:
Originally Posted by Harleyq View Post
Now with headlights on I have front turn signals and pass side R turn signals. Driver side brake light still shining full time w/headlights. Also, as if this isn't enough, I have to hold turn signal switch up or down to get them to work. I'm assuming I have a replacement in the near future....
I would check the ground on the left (driver side) rear tail/brake light. It could be a bad connection where it attached to the body, corroded connection inside the bulb socket, or a damage wire. This would allow the left brake to come on a little less than full bright because it is getting its ground through the tail/brake light circuit.

Yes you will need to replace the turn signal switch.
Reply With Quote
  #6  
Old July 25th, 2023, 06:48 AM
Harleyq Harleyq is offline
Member
 
Join Date: Oct 2022
Location: Medford, Or.
Truck: '66 gmc pu
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 25
Harleyq is on a distinguished road
Default Re: LED issues upon issues upon issues

Thanks James, just got home so will check that first. Going through previous threads, seems the orange wire is carrying power to the black wire which I have power all the way around there at the fuse box, so yea I'm leaning towards bad ground, connection, wire, holding tongue to left when needs to be right. Well here's to hoping for something simple....
Reply With Quote
Reply

Bookmarks

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lubrication issues SWEDE GMC V6 and V12 Engines 9 October 25th, 2014 03:57 AM
Re: scrap issues Archiver Previous Forum Posts 0 March 8th, 2004 01:55 AM
scrap issues Archiver Previous Forum Posts 0 March 8th, 2004 01:53 AM
AC issues Archiver Previous Forum Posts 0 July 15th, 2003 02:52 AM
HEI issues Archiver Previous Forum Posts 0 June 15th, 2003 02:29 AM


All times are GMT +1. The time now is 01:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 751730915004|1729817855|0