Turn Signal Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Silversold · 12-29-2009, 02:13 AM

I've got a problem with my turn signals and could use some help. My radio shuts off every time I turn them on. I also noticed that all the lights dim slightly and flash with the blinker when it is on. Could it be a bad flasher relay? I have not replaced it because I have not seen a bad relay cause all the lights to blink before. Is it possible or any other ideas? The truck is a 66 GMC and I have looked over everything for possible shorts. Thanks

Longhorn Man · 12-29-2009, 05:37 PM

Welcome to the board!
Your flasher is fine, all it does is make the lights flash.
Is this test with the engine running, or turned off?
I would actually first check the charging system, make sure you have full system power before diggingg into anything else.

low79fx · 12-29-2009, 08:06 PM

Check your grounding,making sure that every major body part,i.e. cab,frontend and bed is grounded to frame,engine to frame.I just got through doing a complete rewire on a 65 GMC and the system all references ground through the body to the frame back to the negative on your battery.Hope this helps.

low79fx · 12-29-2009, 09:43 PM

Try this one.Its for 60-66 GMC but I went with HEI ign.which is basically the same at the engine.
http://67-72chevytrucks.com/vboard/s...d.php?t=378484

low79fx · 12-29-2009, 09:55 PM

Quote:

Originally Posted by low79fx

Try this one.Its for 60-66 GMC but I went with HEI ign.which is basically the same at the engine.
http://67-72chevytrucks.com/vboard/s...d.php?t=378484

Sorry dude I got on wrong post,but I posted some drawings which will help with your turn signal issues.

12-29-2009, 02:13 AM	#1
Silversold Registered User Join Date: Dec 2009 Location: Nebraska Posts: 1	Turn Signal Help I've got a problem with my turn signals and could use some help. My radio shuts off every time I turn them on. I also noticed that all the lights dim slightly and flash with the blinker when it is on. Could it be a bad flasher relay? I have not replaced it because I have not seen a bad relay cause all the lights to blink before. Is it possible or any other ideas? The truck is a 66 GMC and I have looked over everything for possible shorts. Thanks

12-29-2009, 05:37 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Turn Signal Help Welcome to the board! Your flasher is fine, all it does is make the lights flash. Is this test with the engine running, or turned off? I would actually first check the charging system, make sure you have full system power before diggingg into anything else.

12-29-2009, 08:06 PM	#3
low79fx Registered User Join Date: Jun 2008 Location: odessa,tx Posts: 208	Re: Turn Signal Help Check your grounding,making sure that every major body part,i.e. cab,frontend and bed is grounded to frame,engine to frame.I just got through doing a complete rewire on a 65 GMC and the system all references ground through the body to the frame back to the negative on your battery.Hope this helps.

12-29-2009, 09:43 PM	#4
low79fx Registered User Join Date: Jun 2008 Location: odessa,tx Posts: 208	Re: Turn Signal Help Try this one.Its for 60-66 GMC but I went with HEI ign.which is basically the same at the engine. http://67-72chevytrucks.com/vboard/s...d.php?t=378484



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