Need led taillight help.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**FRENCHBLUE72** · 06-18-2005, 07:19 AM

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 ..

GMC AMI · 06-18-2005, 02:50 PM

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.

**pjmoreland** · 06-18-2005, 03:16 PM

Does everything work properly with regular filament bulbs?

djracer · 06-18-2005, 04:02 PM

if you are using the led twist in bulbs they can have polarity issues! Does it work right with regular bulbs!

70c10 · 06-18-2005, 04:05 PM

Make sure you have the EL-12 flasher and double check the sockets are twisted in all the way!

**FRENCHBLUE72** · 06-18-2005, 06:35 PM

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???

bagged91 · 06-18-2005, 06:43 PM

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

**pjmoreland** · 06-18-2005, 07:11 PM

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.

**FRENCHBLUE72** · 06-20-2005, 11:34 PM

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?????

**PICKMUP** · 06-21-2005, 10:56 PM

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

**FRENCHBLUE72** · 06-21-2005, 11:47 PM

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???

toolpimp · 06-22-2005, 07:20 PM

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.

06-18-2005, 07:19 AM	#1
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,590	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..

06-18-2005, 02:50 PM	#2
GMC AMI Registered User 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

06-18-2005, 04:02 PM	#4
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,891	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!

06-18-2005, 04:05 PM	#5
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	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

06-18-2005, 06:35 PM	#6
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,590	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..

06-18-2005, 03:16 PM	#3
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,329	Does everything work properly with regular filament bulbs?

06-18-2005, 06:43 PM	#7
bagged91 Out draggin' 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"

06-18-2005, 07:11 PM	#8
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,329	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.

06-20-2005, 11:34 PM	#9
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,590	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..

06-21-2005, 10:56 PM	#10
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,119	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

06-21-2005, 11:47 PM	#11
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,590	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..

06-22-2005, 07:20 PM	#12
toolpimp too many toys 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



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