69 C10 tail light issues

[brandon-n-lisa]

Hey guys, this is my first post, and I hope it is in the right place

I have a '69 Chevy C-10 3 speed, column shift with a non tilt steering column.

My question is this, as simple of a question as it may seem to be;

I am having tail light problems. I just started working on this truck and I'm trying to get it in road worthy condition(It's been sitting beside my house for 5 years). I have checked all of the wiring, grounds and bulbs etc. and even checked the signal switch in the column. This is what happens: the left brake light will not light up when the brake is pressed and the right blinker is on. In all other instances, the left brake light works fine. It only does this when the right blinker is on. Anyone have any ideas as to what this may be? I have been banging my head against the tailgate for a week now trying to get this thing working right.

Thanks for yoru help.

Brandon