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 07-25-2013, 09:52 PM   #1
chevy72pu
Registered User
 
chevy72pu's Avatar
 
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
Blinker, no blinky.

I put a set of LED turn signals on the front of my '72. Installed new turn signals from LMC along with a new front end wiring harness (headlights turn signals, horn, alternator). Modified it per this forum for Internally regulated alternator. Used the flasher provided by the distributor of the lights. With the headlights off all signals flash. With headlights on LED signals do not flash, but all side marker and rear turn signals do flash. LED technician says it has to be in my wiring. Any suggestions as to where I should start looking?
__________________
How 'Bout them Dawgs!

'10 Traverse LTZ
03 Silverado Z71 ext cab
99 Yamaha Grizzly 600
72 C10 350/350 sportside bed.
68 C30 flatbed. 350 4-speed.

"I've got a good memory, it's just short!"
chevy72pu is offline   Reply With Quote
Old 07-25-2013, 10:02 PM   #2
slow-1
Registered User
 
slow-1's Avatar
 
Join Date: May 2013
Location: Central NC
Posts: 830
Re: Blinker, no blinky.

Did they work properly before you plugged their stuff in?

If so it ain't your wires.
__________________
1972 Cheyene C-10 "Ole Green"
My Grandfathers truck (early 70's to 1983)
My first vehicle (1983)
Original 350 (3 rebuilds)
700R4 from Bowtie Overdrives

slow-1 is offline   Reply With Quote
Old 07-25-2013, 10:09 PM   #3
DUD2STUD
Registered User
 
DUD2STUD's Avatar
 
Join Date: Mar 2007
Location: Rohnert park, CA
Posts: 139
Re: Blinker, no blinky.

Had kind of the same problem changed my flasher everything worked fine
Posted via Mobile Device
DUD2STUD is offline   Reply With Quote
Old 07-25-2013, 10:16 PM   #4
chevy72pu
Registered User
 
chevy72pu's Avatar
 
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
Re: Blinker, no blinky.

Yes, they worked with bulbs and standard flasher. Tried the standard flasher from my '68 tonight with same results.
__________________
How 'Bout them Dawgs!

'10 Traverse LTZ
03 Silverado Z71 ext cab
99 Yamaha Grizzly 600
72 C10 350/350 sportside bed.
68 C30 flatbed. 350 4-speed.

"I've got a good memory, it's just short!"
chevy72pu is offline   Reply With Quote
Old 07-26-2013, 12:07 AM   #5
Special-Ed
Registered User
 
Special-Ed's Avatar
 
Join Date: Jul 2013
Location: Floriduh
Posts: 386
Re: Blinker, no blinky.

led's do not draw enough current to cause an old fashioned flasher to work properly...

if everythig works with standard bulbs wiring is good... its that simple.
__________________
Ed will be known as the Tiger Woods of the integration business
Special-Ed is offline   Reply With Quote
Old 07-26-2013, 12:14 PM   #6
slow-1
Registered User
 
slow-1's Avatar
 
Join Date: May 2013
Location: Central NC
Posts: 830
Re: Blinker, no blinky.

Just to clarify, it works right with the new wiring harness and regular bulbs?

If so I would bet its the flasher.

Maybe someone who has LED's can post up what flasher works with the LED's.
__________________
1972 Cheyene C-10 "Ole Green"
My Grandfathers truck (early 70's to 1983)
My first vehicle (1983)
Original 350 (3 rebuilds)
700R4 from Bowtie Overdrives

slow-1 is offline   Reply With Quote
Old 07-26-2013, 02:44 PM   #7
rico7769
Hybrid67
 
rico7769's Avatar
 
Join Date: Jan 2009
Location: Martinez, GA
Posts: 195
Re: Blinker, no blinky.

Upgrade the flasher. Most companies have a snippet at the bottom with the LED's that says you will have to replace it if I remember correctly.
__________________
Keep em' Running!

All show.....no go
rico7769 is offline   Reply With Quote
Old 07-27-2013, 07:41 AM   #8
chevy72pu
Registered User
 
chevy72pu's Avatar
 
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
Re: Blinker, no blinky.

Ok. So last night I removed the leds and insert bulbs.left the low voltage flasher that came with the leds in the fuse panel. Same problem.lights off signals flash, lights on front signals dont flash. Then I swapped in the original flasher. Again lights off front signals flash, lights on they dont flash. I guess there is a problem with the wiring. Just dont know where to start. The new signal buckets with pigtail that I ordered are marked R and L. If those are reversed, could that cause the problem?
__________________
How 'Bout them Dawgs!

'10 Traverse LTZ
03 Silverado Z71 ext cab
99 Yamaha Grizzly 600
72 C10 350/350 sportside bed.
68 C30 flatbed. 350 4-speed.

"I've got a good memory, it's just short!"

Last edited by chevy72pu; 07-27-2013 at 07:44 AM. Reason: stupid spelling
chevy72pu is offline   Reply With Quote
Old 07-27-2013, 08:38 AM   #9
slow-1
Registered User
 
slow-1's Avatar
 
Join Date: May 2013
Location: Central NC
Posts: 830
Re: Blinker, no blinky.

If it were me, I would start a new thread titled "need help with wiring problem" or something similar.

There are guys who are experts on wiring these trucks who may see that and jump in to help you.

All I am is a parts changer.
__________________
1972 Cheyene C-10 "Ole Green"
My Grandfathers truck (early 70's to 1983)
My first vehicle (1983)
Original 350 (3 rebuilds)
700R4 from Bowtie Overdrives

slow-1 is offline   Reply With Quote
Old 07-27-2013, 12:59 PM   #10
Special-Ed
Registered User
 
Special-Ed's Avatar
 
Join Date: Jul 2013
Location: Floriduh
Posts: 386
Re: Blinker, no blinky.

it sounds like a bad or non existing ground... make sure all your grounds are good and verified

right and left dont matter... what does matter is ground and hot, or + and -

so the leds dont flash... what state are they in, on or off when your head light are on?

it sounds like the leds are using the head light circuit as a feedback ground
__________________
Ed will be known as the Tiger Woods of the integration business

Last edited by Special-Ed; 07-27-2013 at 01:08 PM.
Special-Ed is offline   Reply With Quote
Old 08-14-2013, 09:24 PM   #11
chevy72pu
Registered User
 
chevy72pu's Avatar
 
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
Re: Blinker, no blinky.

Well the verdict is in. After chasing theories,removing and reinstalling the LEDS, the wiring and the flasher, I gave up and called the supplier, Rod Worx. Ken asked me a lot of questions, then had me remove the LEDs, and reinstall the 1157 bulbs. Then he had me pull the headlight switch one click to the parking lights and tell him which filament was burning. The short one was burning. He said the long filament is the parking light and should be the one that is burning.He said reverse the wires feeding the turn signal/parking lights and I'll bet your problem goes away. He was RIGHT. I cut the wire in the harness going to the plug and reversed the wires on each turn signal. This was a new wiring harness and new turn signals both from LMC trucks and there is only one way to plug them together. Obviously one of them (the signals or the harness) were wired wrong. Now all lights work correctly. Woo Hoo!
__________________
How 'Bout them Dawgs!

'10 Traverse LTZ
03 Silverado Z71 ext cab
99 Yamaha Grizzly 600
72 C10 350/350 sportside bed.
68 C30 flatbed. 350 4-speed.

"I've got a good memory, it's just short!"
chevy72pu is offline   Reply With Quote
Old 08-14-2013, 09:28 PM   #12
slow-1
Registered User
 
slow-1's Avatar
 
Join Date: May 2013
Location: Central NC
Posts: 830
Re: Blinker, no blinky.

Glad you got it fixed.

I wonder how many folks are driving around with those harnesses...of course they will never know any difference until they switch to LED's.
__________________
1972 Cheyene C-10 "Ole Green"
My Grandfathers truck (early 70's to 1983)
My first vehicle (1983)
Original 350 (3 rebuilds)
700R4 from Bowtie Overdrives

slow-1 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 06:41 AM.


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