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 06-18-2005, 07:19 AM   #1
FRENCHBLUE72
PROJECT 7DEUCE
 
FRENCHBLUE72's Avatar
 
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
Need led taillight help..

Need some help with my new led taillights that I bought they everything works great untill I pull on the headlight switch then the turnsignals don't work still have breaklights but no turn signal's with the headlight switch off everything works including the signals.. I put in a brand new e-flasher to replace the old e-flasher could it be my dimmer switch causing this problem??? I also tried a set of regular off the shelf 1157 led taillights from jam=straight and have the same problem??? Any help would be great.. Thanks in advance ..
__________________
GO BIG GREEN GO DUCKS



MEMBER #6377

72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free.

Project "7DEUCE"

check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665



Tim Powell..R.I.P EastSideLowlife..... R.I.P..
FRENCHBLUE72 is offline   Reply With Quote
Old 06-18-2005, 02:50 PM   #2
GMC AMI
Registered User
 
GMC AMI's Avatar
 
Join Date: Apr 2004
Location: The Other Maine!
Posts: 2,236
The dimmer switch only controls the headlights between low and high beam. Sometimes the contacts get bad and you have no headlights at all when you try switching them. Sounds like a wiring prob to me. Good luck and happy trucking on the west coast.
__________________
1968 Chevy 4x4 307 4 speed
GMC AMI is offline   Reply With Quote
Old 06-18-2005, 03:16 PM   #3
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,982
Does everything work properly with regular filament bulbs?
pjmoreland is offline   Reply With Quote
Old 06-18-2005, 04:02 PM   #4
djracer
Registered User
 
djracer's Avatar
 
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,892
if you are using the led twist in bulbs they can have polarity issues! Does it work right with regular bulbs!
__________________
Kevin

Special Thanks to All who have helped on the TRUCK!

My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4

So Far my best Times are:

Motor only:
6.44 1/8 @ 104.13
10.39 1/4 @ 125.83

Nitrous Times:
5.785 1/8 @ 118.65 with a 1.336 60ft
9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!
djracer is offline   Reply With Quote
Old 06-18-2005, 04:05 PM   #5
70c10
67-72 Addict!
 
70c10's Avatar
 
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,856
Make sure you have the EL-12 flasher and double check the sockets are twisted in all the way!
__________________
Jim

1970 C/10 Fleetside w/Ghost Flames
Lowered 4.5" front and 4" rear (Raked)
355/350 Turbo w/shift kit
10" Redneck Performance Verter w/2500 stall
Hooker Super Comps part#2808-1
Performer RPM Air-Gap
12 Bolt w/3:73 gears- Eaton Posi
Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads
70c10 is offline   Reply With Quote
Old 06-18-2005, 06:35 PM   #6
FRENCHBLUE72
PROJECT 7DEUCE
 
FRENCHBLUE72's Avatar
 
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
I have the el12 flasher brand new have 2 of em.. It does work right with regular red glass bulb's..The rear tails work greatuntill I turn on the headlight switch could that be it???
__________________
GO BIG GREEN GO DUCKS



MEMBER #6377

72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free.

Project "7DEUCE"

check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665



Tim Powell..R.I.P EastSideLowlife..... R.I.P..
FRENCHBLUE72 is offline   Reply With Quote
Old 06-18-2005, 06:43 PM   #7
bagged91
Out draggin'
 
bagged91's Avatar
 
Join Date: Jan 2004
Location: Pitman,NJ
Posts: 1,574
Don't know exactly what your running but I did have a similar problem when I did the flushmounts in my 91. Turned out the problem was a dirty electrical plug and also a loose/dirty ground wire for the rear harness. Give it a shot????

L8R - Joe
__________________
91 GMC Xcab LB-Bags/bd/caddy clip SOLD
72 C10 Cheyenne Super LWB SOLD
92 GMC K1500 Burb
72 C10 Burb (ex. Cheesewagon)SOLD
72 C20 Burb parts truck
71 C10 Burb "project"
bagged91 is offline   Reply With Quote
Old 06-18-2005, 07:11 PM   #8
pjmoreland
Senior Member

 
pjmoreland's Avatar
 
Join Date: Jan 2005
Location: CA
Posts: 5,982
I remember someone saying that the LEDs are highly sensitive to the voltage. If your voltage is too low, then they don't work. I wonder if your headlights are pulling the voltage down just enough to cause problems. Just a thought.
pjmoreland is offline   Reply With Quote
Old 06-20-2005, 11:34 PM   #9
FRENCHBLUE72
PROJECT 7DEUCE
 
FRENCHBLUE72's Avatar
 
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
Ok here is what i have done so far and no workie so far... I replaced the dimmer switch,headlight switch and redid the wireing harness from the rear plug to the taillights still no workie??? I unplugged the headlights and turned on the switch and still no workie.... Has anyone ever had these problems with these or is it just me????? Anyone ever get a bad set of leds?????
__________________
GO BIG GREEN GO DUCKS



MEMBER #6377

72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free.

Project "7DEUCE"

check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665



Tim Powell..R.I.P EastSideLowlife..... R.I.P..
FRENCHBLUE72 is offline   Reply With Quote
Old 06-21-2005, 10:56 PM   #10
PICKMUP
"Trucks with Class"
 
PICKMUP's Avatar
 
Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,158
I normally don't get into trouble shooting parts bought from someone else, but here is a little test: Try them in another vehicle to see if it is the LEDs or your truck!
If you don't install them correctly, you can easily damage them.
I test all of mine before I sell them and provide simple written instructions to help prevent damage.
Good luck
__________________
Email: frankeham@comcast.net
Phone: 360-956-7170
PICKMUP is offline   Reply With Quote
Old 06-21-2005, 11:47 PM   #11
FRENCHBLUE72
PROJECT 7DEUCE
 
FRENCHBLUE72's Avatar
 
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
Framk I have not gottent ther chance to test them in another truck as of yet but I did buy a set of 1157 led red bulbs and had the same problem? I am gonna try em in another truck sometime this week but I am leaning towards a ground problem somewhere???
__________________
GO BIG GREEN GO DUCKS



MEMBER #6377

72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free.

Project "7DEUCE"

check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665



Tim Powell..R.I.P EastSideLowlife..... R.I.P..
FRENCHBLUE72 is offline   Reply With Quote
Old 06-22-2005, 07:20 PM   #12
toolpimp
too many toys
 
toolpimp's Avatar
 
Join Date: Oct 2004
Location: winnipeg sorta
Posts: 63
my .02$ . I had done the same thing with led's. I found that they needed to be grounded to body. Didnt use fancey led flasher. Just use a bosch 44530 or 44520 heavy duty flasher. 2 or 3 prong. Cant remember which is which.
__________________
if we were all fatter we'd be closer together
1971 gmc 3/4 4x4 383 stroked
1968 1/2 2nd owner 4bbl 6cyl
1969 gmc 3/4 4 sale 350 4bbl 4spd
1969 chev 1/2 lowered 5 spd 454 4bbl
1947 chev coupe
2002 harley flhtcui
6 -67-72 my parts
toolpimp is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 04:58 AM.


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