Having a weird issue... left brake light doesn't work- but DOES work when the right turn signal is engaged. Both tail lights work but I loose everything on the left as soon as I touch the brakes (Ecept for the aforementioned turn signal). I thought it might be the sockets since I live on the coast, so I replaced all of them on the left- no luck. All bulbs left and right are new as well. Any suggestions???? If anyone can link a wiring diagram too that would be much appreciated, thanks!!!

 

Your symptoms remind me of what happens on trailer lights when they lose their ground. To test this, you can use a jumper wire to see if the bulb works correctly if you substitute the ground connection in the socket with a direct connection to clean metal on the body. Or you can use a multimeter between the electrical supply and a good body ground.