My 1986 FXRS is not keeping the battery charged. I rode about 60 miles today and stopped for a cold one. When I tried to start my bike the battery was DEAD. I got a jump start and rode home. Bike ran fine, but when I got home the battery was still dead. I put a charge on the battery and it held a charge fine and checked out fine. Any help in solving this problem would be geatly appreciated.