I have a 02 gmc sierra 1500 z71... I am having a problem with one of my trailer lights. I just got done trying to fix it for the last hour... anyway, the left tail light only the running light comes on. it does not come on when i hit the breaks and the blinker. I put a new bulb in it too. it is the second trailer i had this problem on. it has to be my truck. i know i am not the only one that has had this problem. Thanks!!!