2003 Hyundai Elantra side markers won't turn off

I went out to start my 2003 Hundai Elantra yesterday and the battery was dead. I did a double check to make sure I didn't leave anything on and ruled out human error. I jumped the car and it started right up. I drove it for about 30 minutes and heard clicking coming from under the dash on the drivers side. Every time I heard this clicking (it seemed to click then take a few seconds and click again) the clock and dash lights dimmed. We stopped the car, turned off the key and saw that the side markers were still on so I double checked that I turned the lights off and they were. We popped the hood and opened up the fuse panel and started wiggle testing wires. The weird thing was the lights would go on and off when the battery was moved (hood closed and doors closed along with physically moving it). Does anybody know if and what switch would possible control this or if it would be anything else. Fyi- I just brought the car home and put it in the garage and unhooked the battery so as to not kill the battery again. I plan on taking it to Advance to have the battery and alternator tested today after work.