Jacob - I believe that you can find a device at RV dealers that will help you do what you want. At the simplest it is a couple of high power diodes, but I am told that there are other more sophisticated devices availalbe. So you might talk to your local RV dealer to see what he reccommends.- Dr. Megacycle KK6MC/5 -- James R. Duffey KK6MC/5 Cedar Crest, NM DM65