My front turn signals stop working when I pull on my headlight switch. All bulbs, sockets, connectors, fuses, and grounds checked and functioning properly. Flashers work as they should.
BUT, once the headlight switch is activated the front turn signals STOP blinking. The rear turn signals and marker lights work as they should, it's just the front two turn signal bulbs that stop blinking and stay just lit.
Upon further testing at the front turn signal sockets, with the bulbs removed, I'm getting 12 volts on both the turn signal side of the bulb tip and the parking lamp bulb tip when the parking lights are turned on. With the parking lights off and the turn signals activated, only the turn signal side of the socket carries 12 Volts, like it should.
Any ideas where this head light voltage could be leaking over to the turn signal side of the circuit? Could it be in the turn signal switch in the steering column itself? Thanks in advance, Denny
It could be a bad headlight switch as well. What happens when you turn on the console toggle switch for the rear running lights? Bad flasher due to extra load?
QuoteWhat happens when you turn on the console toggle switch for the rear running lights?
???? ???
Quote from: 69 GT350 Vert on February 29, 2024, 07:04:02 PM
It could be a bad headlight switch as well. What happens when you turn on the console toggle switch for the rear running lights? Bad flasher due to extra load?
I think you need to clarify what you mean by "rear running lights."
When you checked the grounding points did you physically disassemble & clean them? Just a visual inspection can be misleading. Also wiggle the wiring to see if the strands are weak or broken beneath the insulation. 50+ year old wiring can get brittle. If that pans out then check the connections at the T/S switch and H/L switches and connections between those and the T/S lamps. Still sounds like a bad connection or ground to me, possible corrosion issue.
I should have said Interior toggle switch on the console. I'm pretty sure that turns on the front and rear side marker lights, the rear tail lights, and the dash lights on my car. I don't believe the front turn signal running lights turn on with the Interior toggle switch on my car, but this is going from memory.
Quote from: 69 GT350 Vert on February 29, 2024, 09:46:59 PM
I should have said Interior toggle switch on the console. I'm pretty sure that turns on the front and rear side marker lights, the rear tail lights, and the dash lights on my car. I don't believe the front turn signal running lights turn on with the Interior toggle switch on my car, but this is going from memory.
One toggle switch is for the fog lights and the other for interior lights only and not rear and side marker lights. Rear and side marker lights are controlled by your headlight switch .
To answer a couple of your questions:
I did replace the headlight switch, and no change in results.
I did physically pull the ground wires and clean the ground wire terminals, screws, and frame points.
Could it be one of the flasher units? I think there are two, one for the turn signals and another for the four ways, is that correct? Thanks
Cougar's Unlimited LLC has a troubleshooting guide for 69-70 Shelby's on their website try that. It was helpful when I had a problem with my 69. They might even have the part you need. Or try calling them
http://www.thuntek.net/cougars_unlimited/69seqts.htm
If your console toggle switch operates anything other than (a) fog lamps or (b) interior lights, then this is your problem...sounds like someone has butchered your wiring somewhere...Good luck... :)
TOB
Thank you, Dan. I'll use the Cougar troubleshooting guide next and see what happens.
TOB, fog lights and interior lights are all testing good. Thanks
Quote from: 69 GT350 Vert on February 29, 2024, 09:46:59 PM
I should have said Interior toggle switch on the console. I'm pretty sure that turns on the front and rear side marker lights, the rear tail lights, and the dash lights on my car. I don't believe the front turn signal running lights turn on with the Interior toggle switch on my car, but this is going from memory.
My bad...I responded to the wrong post... :-[
TOB :)
You havent changed bulbs lately have you?
I put all new bulbs in two days ago, as part of my trouble shooting. Bench tested them all prior to installation. Thanks
Park and turn signal wiring switched ? front turn signal working ok with headlights off ? which filament lights ?
It appears that the brightest filament is the parking light side of the bulb. Thanks
The reason I ask is its very common for people to pick a bulb that looks correct and fits, but is not correct
Ok everyone who replied to my earlier post, problem found, and issue solved. Front turn signal assembly was wired incorrectly from the factory. Both sides, right and left turn signal assemblies had the power from the turn signal light routed to the parking light side of the bulb. Once reversed, they worked as they should. Lincoln Tech, you were spot on with your comment. My guess is that the previous owner never knew the front signals didn't work with the headlights turned on, ever since he replaced the assemblies years ago, during restoration. I only discovered the problem after a friend of mine noticed that my turn signals weren't working, one morning when it was early enough that I had my headlights on when we were gathering to go to a local car show. See photo of repair solution.
Hi. Your harness is not correct. The brown ground with eyelet should be part of it. 3 pins connectors.
WCCC and Branda supply them
Patrick
I'm glad you got it resolved , thank's for letting us know . There seems to be individuals on this site that ask for help but never reply as to whether the problem got fixed or not ( makes you not want to get involved )
Yes, the third wire should be attached to the base of the socket. Are those assembly housings aftermarket?
These are definitely aftermarket assemblies, no manufacture markings on either one. My guess is a product made overseas somewhere. The original OEM harness is in place on the car, and there are only two wires going to each plug that feeds the parking light/turn signal assembly. The sockets pick up ground from the frame through the mounting hardware. No third wire for grounding built into the harness.
Thanks again Lincoln tech!