Thank you for the feedback and additional information.
There are 7 wires coming ot of the TS switch. I was able to upload the wiring diagram (see attached). All the lights (front and rear) are new dual element bulb types (no LEDs). The parking lights all illuminated correctly with my headlight switch in the first detent.
The #7 yellow wire is not connected, the flasher is integrated into the fuse block.
I will get a picture of the connector where the TS switch and harness meet to add some insight.
It sounds like my understanding of the brake light switch interaction with the TS switch is off in that the movement of the TS switch breaks the connection between the brake switch provided power and the flasher provided power to the appropriate rear light. That being said I think my problem remains that the power getting into the TC switch from the brake light is not being connected internally to the rear lights.
