A recent message said that while I am on the road my truck is actually not doing very much charging of the batteries in my 5'er. The trailer carries two group 27 deep cycle batteries. The poster sai...
You may want to measure the charge current before you change anything. Pull fuse in the cgarge line & put an ammeter acros it. I never had any problems charging the batteries in my 5er. When I boone docked for several days just plugging into the truck for an hour or so didn't help much. I would use jumper cables, start my truck & they charged quickly.