Turn signals are acting weird - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 03-04-2005, 12:24 AM

Tonight I noticed my rear turn signals acting up

. If the running lights are OFF the rear blinkers work normal. If the running lights are ON and you use the passenger blinker for example, it works fine but the drivers side also "barely" blinks at the same time. It does the same on the other side with that blinker working correctly and the other one "barely" working as well. What would cause the opposite to blink only when the running lights are on?. I never noticed this since owning the truck. The turn signal switch is new from the Chevy dealer as well as all new bulbs. I'm stumped

Longhorn Man · 03-04-2005, 12:46 AM

do they alternate....or blink and barley blink at the same time?
does the back up lights glow at all when doing this?

70c10 · 03-04-2005, 08:41 AM

Andy, they blink at the same time. The one I don't want to blink barely blinks but is noticeable. My backup lights have never been hooked up since I have owned the truck.

Longhorn Man · 03-04-2005, 09:15 AM

dude...that is a new one by me.
You'll be told to check your grounds...but this isn't a ground issue, they would be alternating if it was. Some how, you are getting power (albeit minimal power) to the other side.
This is just a guess, but I think it has to be in the column, so replacing the switch would be my first step.
If you do this, you can verify it before doing any work by just plugging the new switch under the dash and checking for what happens...don't forget the plug harness adapter you'll need too.

70c10 · 03-04-2005, 09:21 AM

I already replaced the switch. I will check again tonight.

Putter · 03-04-2005, 10:50 AM

If the barely-blinking one is getting dimmer, then I would venture to say it is just a loss of voltage. Maybe battery is weak or alternator is weak. Similar to what happens to the headlights when you run larger stereo systems.
If the bulb blinks a little brighter....then I am stumped.

Try this....remove the red lens to the one that is NOT supposed to blink and then turn on the running lights and opposite blinker. Look closely at the bulb that is NOT supposed to be blinking. One element inside will be lit because of the running lights. See if the OTHER element is lighting at all. That will tell you if it is ACTUALLY blinking.

krazy_texan · 03-04-2005, 10:55 AM

i had the same problem long time ago but for the life of me i cannot remember what i did for it, i think i just rebuilt the wiring harness because at the time it needed it.

70c10 · 03-04-2005, 01:50 PM

I'll try that Putter. The truck was not running when I was testing it. Anybody else have any input?

03-04-2005, 12:24 AM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Turn signals are acting weird Tonight I noticed my rear turn signals acting up . If the running lights are OFF the rear blinkers work normal. If the running lights are ON and you use the passenger blinker for example, it works fine but the drivers side also "barely" blinks at the same time. It does the same on the other side with that blinker working correctly and the other one "barely" working as well. What would cause the opposite to blink only when the running lights are on?. I never noticed this since owning the truck. The turn signal switch is new from the Chevy dealer as well as all new bulbs. I'm stumped __________________ 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 Last edited by 70c10; 03-04-2005 at 12:35 AM.

03-04-2005, 08:41 AM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Andy, they blink at the same time. The one I don't want to blink barely blinks but is noticeable. My backup lights have never been hooked up since I have owned the truck. __________________ 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

03-04-2005, 09:21 AM	#5
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I already replaced the switch. I will check again tonight. __________________ 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

03-04-2005, 10:50 AM	#6
Putter More Cowbell.... Join Date: Mar 2004 Location: Puckett, MS Posts: 3,569	If the barely-blinking one is getting dimmer, then I would venture to say it is just a loss of voltage. Maybe battery is weak or alternator is weak. Similar to what happens to the headlights when you run larger stereo systems. If the bulb blinks a little brighter....then I am stumped. Try this....remove the red lens to the one that is NOT supposed to blink and then turn on the running lights and opposite blinker. Look closely at the bulb that is NOT supposed to be blinking. One element inside will be lit because of the running lights. See if the OTHER element is lighting at all. That will tell you if it is ACTUALLY blinking. __________________ *There once was a member from Puckett.....Who ( fill in the blank blank blank* ) bucket**

03-04-2005, 10:55 AM	#7
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	i had the same problem long time ago but for the life of me i cannot remember what i did for it, i think i just rebuilt the wiring harness because at the time it needed it. __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

03-04-2005, 12:46 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	do they alternate....or blink and barley blink at the same time? does the back up lights glow at all when doing this?

03-04-2005, 09:15 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	dude...that is a new one by me. You'll be told to check your grounds...but this isn't a ground issue, they would be alternating if it was. Some how, you are getting power (albeit minimal power) to the other side. This is just a guess, but I think it has to be in the column, so replacing the switch would be my first step. If you do this, you can verify it before doing any work by just plugging the new switch under the dash and checking for what happens...don't forget the plug harness adapter you'll need too.

03-04-2005, 01:50 PM	#8
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I'll try that Putter. The truck was not running when I was testing it. Anybody else have any input? __________________ 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

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