Leak in cab
 

Good morning all: New member here, just signed up. I have a 1994 F350, and have a problem with water leaking down from cab. I believe it is comming from one of the cab lights. I put silicone around the edges of the lights but this just compounded the problem. It seems I did a poor job as water still came in. Is there a better solution to the problem? Should I just seal the back portion of light and let water drain to windsheild, or try to just glue down the bottom of rubber boot on light? any help would be helpful, thanks in advance.
Steve