The bike is a 2004 R1150R Rockster 20,000 miles and has ABS. The battery is not holding a charge. I put it on the trickle charger and it will take a full charge. I can stop to fuel up and it will restart but after a day(12 hrs) at work it will not start. I have replaced the battery and it is doing the same thing. I am guessing alternator possibly?