Progress made, but still no brake light on left

The turn signal is the one I bought from you. I believe that I've connected the switch wires correctly, but not 100% due to the previous owner's haphazard splices and difficulty matching the wires by color.

I would think that the ground for the left turn signal would be the same as the ground for the left brake, but electrical issues are my weakest point.

I can say that the switch is remarkably stiff, feels like I'm nearly breaking it to activate the turn signal.