2013 KEYSTONE COUGAR Electrical System Problems

WE OWN A 2013 KEYSTONE COUGAR 5TH WHEEL MODEL 331MKS. ON 4/4/14 WE WERE AT A CAMPGROUND AND STARTED TO SET UP. THE RIG WAS ONLY ON 12V BATTERY POWER. I HAD NOT YET CONNECTED TO SHORE POWER. WHEN I PUSHED THE BUTTON TO LOWER THE LANDING GEAR, NOTHING HAPPENED. I TRIED THE REMOTE CONTROL, AND NOTHING HAPPENED AGAIN. I WENT TO GET THE POWER CORD INTENDING TO PLUG IT IN. THE CORD WAS IN THE STORAGE AREA IN THE FRONT, UNDER THE HITCH, WHERE THE BATTERY IS. WHEN I OPENED THE DOOR, IMMEDIATELY SMOKE WAS BILLOWING OUT. THEN I SAW THE FLAME. IT WAS COMING FROM THE CIRCUIT BOARD ABOVE THE BATTERY.I IMMEDIATELY GOT THE FIRE EXTINGUISHER. AFTER USING IT SEVERAL TIMES, THE FLAME KEPT COMING BACK. I CALLED 911 FOR THE FIRE DEPARTMENT. THE PROPANE TANKS ARE RIGHT NEXT TO THE AREA BURNING. I IMMEDIATELY REMOVED BOTH OF...