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Blinker problems

71GTX440

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12:09 AM
Joined
May 19, 2014
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Location
Fort Knox, KY
Took the 71 RR out for a drive since the weather in TN has been amazing as of late. Have started my car periodically while in my garage so all seals/gaskets/etc stay fresh and do not dry out.
When I turned on my blinker, the light on my dash stayed lit up. After the drive, pulled back in to the garage and started to work on diagnosing the problem.
Ran continuity across all wires in the blinker circuit and all checkout out as good. Long story short, I disconnected the lower, front valance lights and now my blinkers work with no problems. Figured I had the problem solved, just needed to rebuild the connectors and wires (nope!). Plugged rebuilt lower lights in and same problem instantly popped up when I turned the lights on and turned the blinker on.
Perhaps I rebuilt the lights incorrectly so I tested each light assembly and plugged them in, one at a time. With one light assembly installed, no issues. I can put one on either side and there are no problems. As soon as I plug both light assemblies in the blinker issue comes back.
I do not know, what legitimately I should be checking for now.
Running through the wiring schematics, I cannot find any breaks in the wires or loose grounds. Rebuild lower light assemblies and installed a new headlight switch. Still not fixed.

Any help would be greatly appreciated!
 
They always say if it's goofy it's probably a ground. When I'm having these issues I just use a jumper wire with an alligator clip, clip it to the negative post or a known good ground then manually ground the suspect housing.
 
Any chance it could be the flasher? I recall my first Road Runner back in '69 was ordered with the bullet fender mounted turn signal indicators and they did not work. Took it back to the dealer and they installed a heavy duty flasher. Problem solved.
 
you might have a bulb that the two elements are shorted together do the park lamps work, are they bright, with the park lamps on do the turn signal dash lights come on?
 
do the turn signals flash when you turn them on and the dash light is on but does not flash ?
 
You didn't say if one side works but not the other. I would check the simplist. Is the bulb good and socket making connection to it.
 
I think 'ranger' might be right, sounds like a bad flasher. 747mopar is also right on the money with checking ground with a jumper.
 
I posted somewhere before that I've seen a flasher work for one side and not the other. It's only a 2-prong so shouldn't make a difference,(power in-power out) but it does.
 
If one side works but not the other is pretty much the turning switch or related wires to that side. The flashers sources by just ONE WIRE the turning switch to BOTH sides ;)
 
Nacho I'm sorry you're kinda wrong here. I've seen it more than once. Probably a power/ground issue in wiring. But a new flasher will fix problem, can't be too many ohms resistance that causes problem.
 
If some ground/power problem then flasher is not the problem, no matter if change the flasher "fixes it"
 
Any chance it could be the flasher? I recall my first Road Runner back in '69 was ordered with the bullet fender mounted turn signal indicators and they did not work. Took it back to the dealer and they installed a heavy duty flasher. Problem solved.
I installed a new flasher. Thank you for the reply
They always say if it's goofy it's probably a ground. When I'm having these issues I just use a jumper wire with an alligator clip, clip it to the negative post or a known good ground then manually ground the suspect housing.
 
They always say if it's goofy it's probably a ground. When I'm having these issues I just use a jumper wire with an alligator clip, clip it to the negative post or a known good ground then manually ground the suspect housing.
I will try the alligator clip/ground wire combo. Thank you
 
You didn't say if one side works but not the other. I would check the simplist. Is the bulb good and socket making connection to it.
I rebuilt both lights, by themselves, the system works. I install both lights, I get the flasher fault. Right flasher light stays lit on the dash
 
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