Hi, New to this forumand i have a question to start. I have a 2008 Chevy 3500HD crew cab long bed single rear wheel Duramax with Allison with factory brake box and towing package. I tow an 18ft gooseneck horse trailer with living quarters that has a coach battery that is used for the breakaway source as well. I realized when my wife used the trailer for a long weekend that the truck was not charging the coach battery that I do not have 12v at the rear plug of the truck. Upon further investigation I read in the owners manual that there is a wire that needs to be connected in the engine compartment. There are two studs at the front of the fuse box in the engine compartment. One (closest to the engine) has a wire connected to it. the second stud(closest to the fender) is empty. Is there a wire hidden somewhere along the fender well that needs to be connected to that stud? Does anyone know what I'm talking about?
Any reply would be greatly appreciated, thanks ,Neal