Wiring Help Please - ID Wires?

[Tug87]

Hi All,

First let me say I'm not be best at wiring but would love to learn more.

I'm having some trouble with my Suburban. My right turn signal turns on when I apply brakes as well as the gauge lights.

I recently replaced the rear brake light and sign marker light wiring harness as it was very brittle and I'm thinking these extra wires may be the cause of some of it.

Would you please help me identify the following wires (pictures attached)?

On the drivers side I have a second connector after the tail light connector with two wires entering and exiting the connector.
- One of the wires is in the body harness and runs through the headliner down the D post into this extra connector. Seen in picture 1
- The other enters the back of the body harness which connects to the tail light connector. Seen in picture 2

On the passenger side I have an extra brown wire coming out of the body hardness which runs though the headliner and down the d post.

Lastly does anyone make trailer wiring for the 71 suburbans? Thank you!