How do I fix my right tail light

All lights, turn signals and break lights worked fine before this. I replaced turn arm. It was shorting everything out to where I didnt get break after I used the turn signal. Thats fixed now. I replaced brake switch too. No bulb change ever in two years since I got the car. Everything works fine except that.

From under the dash by the break? I haven't seen or smelled anything. I can check again. What about the contacts in the column under the steering lock disc? I didn't replace that when I replaced the turn arm.

OK. If not, do you think it may just be the turn signal switch? In my book it shows one main ground for both sides. I haven't located it yet. There is a ground going into the bulb. I found water in the lense that had come in through the insertion hole. (Bad seal)The bulb still works. All that had been fixed. No bad connection there. I didn't blow it out though. I will check it again. Would a little do it? I will check it.