ok, i must be the biggest dumbass. i read all of the other installation posts for the el door sills, i got as far as i could, but they were so vague. i have all of the wiring set up. i just need to know how to connect the black (ground wire) to the drivers side door open sensor. the posts i read said that it just gets 'connected' to the plug. i know it gets connected, but HOW? do i have to solder the wires, combine them? where do i put them? i need help...................somebody, anybody.........please.