I'm a newbe and i purchased a 1987 25 ft. Aljo travel trailer and know little how to run it. so i have lots of questions..........It had been sitting for a year and water was out of the 2 connected batteries so i replaced them with two 12 volt batteries from bimart. When I charged up the 2 new batteries and put them in my Aljo, 6 of the 12 electric over head light bulbs blew out when i turned them on...they came on for a second and died. I don't think this would be important but there is a small solar panel on the roof thats wired into the batteries also i asume.. I did read the Aljo manual and it said it was a 12 volt system. Seems like it's getting to much power.