I have a 97 and a 2005 .... My 05 has a wire in the trailer wire bundle that goes to the battery, I Believe for brakes... I can't find the same wire in the 97 which I need for some lighting.... Don't really want to run a wire all the way forward but I am concerned that adding a 55w back up light to the existing factory circuit (20a fuse) will be to much of a load... Thoughts??