Turn Signals Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SLVESSELS · 08-14-2008, 06:22 AM

My Turn Signals Work When The Headlight Are Off But When I Cut The Headlights On They Stop Working And My Brake Lights Are Working Properly.

ChevLoRay · 08-14-2008, 07:39 AM

It's probably a grounding issue. After 40 years (plus/minus 2), electrical connections degrade. There is also a wiring harness for the lighting on the front of the vehicle that really isn't hard to change out. I had to change mine after the wire from the terminal block on the right fender became grounded on a header and fried. Note: I do not recommend trying to pull a grounded hot wire (from the battery) into two parts with your bare hands...

But check the ground wires and make sure the metal beneath them is clean and that the bolts/washers are, too. Rust makes an excellent insulator, so get rid of it. If the problem still exists after this, it's probably harness time. Check www.wiringharness.com. They have harnesses that are correctly colored and with the proper connectors. I guarantee that it will be "plug and play". There are also vendors here who have harnesses.

68gmsee · 08-14-2008, 08:37 AM

I agree.. Here's a post with my problem.

I went overboard but I fought this for a week and decided I was going to make sure I had a good return to the battery from all the points (cab, engine, frame).

http://67-72chevytrucks.com/vboard/s...ight=grounding

SLVESSELS · 08-27-2008, 08:26 PM

I Fix My Turn Signal Problems It Was May Grill Parking Lights The Plug Had A Bad Connection I Cleaned It Out With Pb Blaster And Sand Paper Work Great Now

08-14-2008, 06:22 AM	#1
SLVESSELS Registered User Join Date: Oct 2007 Location: RICHMOND VA Posts: 28	Turn Signals Problem My Turn Signals Work When The Headlight Are Off But When I Cut The Headlights On They Stop Working And My Brake Lights Are Working Properly.

08-14-2008, 07:39 AM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Turn Signals Problem It's probably a grounding issue. After 40 years (plus/minus 2), electrical connections degrade. There is also a wiring harness for the lighting on the front of the vehicle that really isn't hard to change out. I had to change mine after the wire from the terminal block on the right fender became grounded on a header and fried. Note: I do not recommend trying to pull a grounded hot wire (from the battery) into two parts with your bare hands... But check the ground wires and make sure the metal beneath them is clean and that the bolts/washers are, too. Rust makes an excellent insulator, so get rid of it. If the problem still exists after this, it's probably harness time. Check www.wiringharness.com. They have harnesses that are correctly colored and with the proper connectors. I guarantee that it will be "plug and play". There are also vendors here who have harnesses. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

08-14-2008, 08:37 AM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Turn Signals Problem I agree.. Here's a post with my problem. I went overboard but I fought this for a week and decided I was going to make sure I had a good return to the battery from all the points (cab, engine, frame). http://67-72chevytrucks.com/vboard/s...ight=grounding

08-27-2008, 08:26 PM	#4
SLVESSELS Registered User Join Date: Oct 2007 Location: RICHMOND VA Posts: 28	Re: Turn Signals Problem I Fix My Turn Signal Problems It Was May Grill Parking Lights The Plug Had A Bad Connection I Cleaned It Out With Pb Blaster And Sand Paper Work Great Now



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