[Scot] I have a ' 98 25 ft. 5th wheel and have had no complaints till now. Something is wrong with the DC system. Everything works on AC current except the radio and the slide out pump, so I am assuming those are both 12 volt only. Nothing works on 12 volt only. I have used the same battery to hook up directly to slide-out pump with jumpers and it has worked fine so battery has juice. All 12 volt fuses look fine. Can find no in-line fuses. Not a decent wiring diagram, at least for me, to look at. Any suggestions?