To lacofdfireman, a simple way of connecting your RV and towed lights is to buy three off the shelf no hassle items. Pollak, Hopkins and RV Designer each make all three items. First item is an adapter from the seven blade type outlet on your RV to a flat four outlet, second is a five foot flat four cable with a tow vehicle plug on one end and a towed vehicle outlet on the other end, third is to buy a standard four wire cable(usually 25 foot) with the towed vehicle plug already attached to one end. Now your all the way back to the towed's lights and you can attach the cable any one of the several satisfactory methods mentioned in earlier posts.
From your RV to your towed everything is factory made with no splices required. You will have a plug exposed on the front of the towed but there are a lot of ways to hide it. Of course you could drill a hole in your bumper cover and put a socket in the hole, what ever floats your boat. The big thing is the adapter from 7 to four, that costs +/- $10.00.
