The car is a '71 SS. The light has worked for a long time before but luckily my mom was driving behind me and caught this for me. I can have my lights on and the back tail lights come on, but the leftmost light where the brake/signal is does not come on when the brake is pressed or the signal is turned on. I checked all other lights and everything else is functional, and I checked with lights on and off. Does this just mean the bulb is bad? Thanks.