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1,643 Posts
I had a similar problem on my '66 coupe years ago, they failed my inspection because the left front turn signal didn't work with the high beams on, but worked any other time (I got it inspected elsewhere.)
I don't think you are going to find an easy solution. I bought the wiring diagram for my car, $6, and started tracing things out and testing. I found all kinds of anomalies behind the dash, bad grounds, back feeding circuits, replaced wires, melted wires. I decided to replace the turn signal switch (since it was in bad shape) and straighten everything else out as best I could. I never pinpointed the exact cause of the problem, but it went away with straightening out the mess behind the dash.
Wish I had a simpler solution, maybe someone else will.
http://www.bluefinger.net/my25.jpg
Jason
Formerly Bluestangcom
"Got gas?"
Vintage Burgundy'66 Conv. 289 & C4. GT-ized
Strawberry/Silver '91GT
Guards Red 2000 Porsche Boxster
http://www.bluestang.com
I don't think you are going to find an easy solution. I bought the wiring diagram for my car, $6, and started tracing things out and testing. I found all kinds of anomalies behind the dash, bad grounds, back feeding circuits, replaced wires, melted wires. I decided to replace the turn signal switch (since it was in bad shape) and straighten everything else out as best I could. I never pinpointed the exact cause of the problem, but it went away with straightening out the mess behind the dash.
Wish I had a simpler solution, maybe someone else will.
http://www.bluefinger.net/my25.jpg
Jason
Formerly Bluestangcom
"Got gas?"
Vintage Burgundy'66 Conv. 289 & C4. GT-ized
Strawberry/Silver '91GT
Guards Red 2000 Porsche Boxster
http://www.bluestang.com