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Hello I will help you with your question,
Have you traced the wiring from the lamp connector up to the turn switch connector at the base of the steering column?
I think you will find wire damage along the harness and green corrosion at the point of damage.
Let me know how I can help
The yellow wire connects to the large connector at the base of the steering column where the wiring goes up the column to the switch.
I would think you have a wiring in the door sill area, it is common.
Is the vehicle trimmed up and running or is it in a state of disassembly?
OK, there is the curved connector for the column wiring and there is another connector near the front of the left door that the yellow wire passes through.
Check there and under the door sill plate running to the rear. Maybe someone ran a screw though it.
Sure, I was in bed when you replied.
There is a curved connector on the steering column, it has both the dark green and the yellow wire from the turn switch. First try to slip a pin along the wire so you can measure with the connector plugged up. See if you have the flash of the right signal at the green wire then check the yellow wire in the left position. If you have the 12 volt signal at the connector it is between the connector and the light. Next stop large connector near the left door,