Turn signal trouble shooting

Yeh if you don't have anything out of the column that is starting to sound line the TS switch When you have an integrated hazard flasher switch as yours does, that can kill the rear lights but the fronts should still work if the TS switch itself is OK. I would wiggle stuff good

Here again, I'd get your connector drawn out, wire colors, and functions, so you can quickly figure what is up.

Inputs: Key off, you should always have hazard flasher power. If any doubt, jumper the hazard flasher connector and that of course will give you full time power from that circuit This should feed to all 4 corners with flasher engaged

Brake switch power: Anytime pedal is down, you should have power on that line and with switch centered, to both rear lines.

If it won't do that and you for sure have power to the switch, then the switch has gone away