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Ghost in the machine....
#1
Gents,
Hoping to get some direction on fixing turn signal and dash light issue. Idea
Here's the symptom:
When the light switch is pulled "on" all lights come on ( good!) - but the right turn signal indicator light on the control panel comes on as well (bad?) Doesn't blink, just a solid light. Turn signal works when engaged. Here's the fun part- all the dash lights blink as well. Tongue
Moving to the left turn signal with light switched "on". No solid light, and when engaged, no light or blinky blinky sound from the relay.

Now we turn the light switch "off":
Lefty and Righty both work- and all the dash/console lights blink. Does the same when I pull the hazard switch.

It appears this is a problem that I inherited - when I opened the dash and pulled the instrument panel, I found were someone had been tracing wires and leaving notes on the old ribbon.

Am I chasing a short? Do I have a mismatch in my harness connector? I'm going to execute Midlife's short finding protocol later this week, and would appreciate any of your experience / expertise in exorcising this ghost from our machine.

What's been replaced in the last 3 months:
Instrument panel ribbon
Instrument panel voltage regulator
Turn signal switch/ harness
We've gone to LED everywhere under the dash we could (no wiring changes)
Car appears to be well grounded - battery to fender to block.
Running PowerMaster alternator

Thanks-
Butch

"A really great man is known by three signs-generosity in the design, humanity in the execution, moderation in success." -Otto VanBismark

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#2
try this for a 71-72.
Open up the Amber front turn signal under the front bumper on the side that is stuck on when the lights are turned on.

on a 73 pull the bulbs from the sport grill these are running lights and blinkers.

so for example if you turn the headlights on and the right blinker is stuck on, then open the right side front blinker and remove the bulb from the socket, get back in and retest electrical.

many times, the problem is the front blinkers shorting out in the housing from corrosion, they are exposed to the most water.

You can also go around the car and keep pulling bulbs until the problem stops, then go back and reinstall the bulbs before that last one to narrow down which circuit is shorting out.

I had to replace both front lower front turn signals on my car as the housing was shorting out and corroded badly it caused some the symptoms you are seeing.

on a 71-72 you can replace the turn signal housing with Reproduction parts. or you can attempt to repair the original socket which is difficult.
on the 73 the sport grill sockets can be cleaned out it is possible to pop the plastic housing from the harness there are bullet connectors inside however they can break off. it might be better to try and soak them in a rust remover then REALLY clean them out with electrical cleaner and get a sanding stick inside to get the crust off the socket contacts. The 71-72 sport grill sockets are similar but only have 2 connectors the 73 has 3 for the turn signal and running lights.
when you really clean them out you might want to check with a volt meter or a continuity tester, so see if they are still shorting and a good idea to use a Q-tip and coat the inside connectors and blub connectors with Dielectric grease to keep it from rusting again.


another possible short area involving the blinker circuit is the steering column, the blinker circuit and switch could be shorting on the column, i've seen it happen a few times. sometimes the horn contacts are heavily worn and they flake off metal which falls down the column onto the hazard and turn signal switch and causes a short. sometimes the blinker switch or the turn signal switch breaks and shorts out also.
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#3
Magnum 
Thanks- I was so focused on under the dash, I didn't think about the contact points at the bulbs. We'll pull them this week and give 'em a good going over. Good point on the dielectric lube - preventive maintenance always beats reactive repairs!

"A really great man is known by three signs-generosity in the design, humanity in the execution, moderation in success." -Otto VanBismark

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#4
Make sure the emergency flasher switch (on the column) is pushed in all of the way.

But I have also seen similar weird problems when a bulb goes. Check all with dual elements.

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#5
I like what 72HCode had to say. Sounds like a grounding issue to me, and probably not in the dash area.
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#6
I had blinker probs when I first got my 73.

Combo of dirty bulb sockets and rusty harness grounds front and rear.
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#7
Thanks to everyone for the advise. I began the work tonight-finished to front running lights and turn signals - they were a mess. Hopefully be able to get all the sockets and ground points cleaned by this weekend. I'll post an update on whether it solves the problem....

"A really great man is known by three signs-generosity in the design, humanity in the execution, moderation in success." -Otto VanBismark

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#8
Wrench 
Hey guys, great news- cleaning the sockets, lubing them up and cleaning the ground in the trunk seems to have fixed the issue. I found 2 tail light sockets that need to be replaced, but was able to get them functioning well enough to complete the troubleshooting. Thanks for the guidance & support.

Butch

"A really great man is known by three signs-generosity in the design, humanity in the execution, moderation in success." -Otto VanBismark

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