Brake Light Issue

[marbles34]

Hey All,

I have an 80 Chevy 2WD Stepside that the left brake light and left rear blinker doesn't work. The left front blinker works, the right front blinker works, the right rear blinker and running light all work. The only time the left rear brake light/blinker works is when the right blinker is turned on. Is this a possible issue in the blinker switch in the steering column?

Thanks in advance!
Chris