My trunk latch is broken and my left tail light signal no longer works. No my front signal doesn't work either. When the signal switch is turned on for that side it makes a humming electrical noise. When I mess with the bubl I can't get out it works for a minute then just the front flashed really quick then it doesn't work again. I think its when I hit a bump. Is it the back tail light bulb or the trunck banging occassionally?