Posted 6/2/2006 01:36 (#16463 - in reply to #16431) Subject: RE: Seven pin diagram
NW Washington
Here is how a 7 pin trailer plug is supposed to be wired and there is a spot for 12 vdc. The 12 volt line is sometimes used to keep the emergency/break away electric brake battery on the trailer charged. http://www.chuckschevytruckpages.com/trailerlights.html