I know there's a second wiring harness tied up between my bed and cab on my truck to run into the bed for a 5th wheel. Saw it today but didn't have time to pull it down and see what the end of it looks likes and what I'm gonna need to get it functional. I know there's a slot in the bed to run the wires through but is it as simple as just wiring it up to a 7 pin connector? Looks like I could see wire color labels on it.