Originally Posted by gbaglo
Guess I need to eliminate the 4 pin. There is lots of wire bundled there, so not sure why they wouldn't go direct.
Often the trailer wiring kit ends in a four-pin, so using the adapter-style 7-blade socket saves making a couple connections. In my case, I didn't have a permanent mounting bracket I liked, so fewer permanent connections had some appeal, but mostly it was convenience of using the kit's existing connector... and that I had not yet learned this lesson.