I have a 2003 GW that I ride every day. Last night after I made a few stops and at my last stop the bike would not re-start. I got a jump from a car and it started right up. I rode it home (about 20 minutes) without any problems. It would not start again. I'm assuming that the original battery is only good for 3 years and plan on buying a new battery today. Is there anything else I should check like the charging system? If so how is this done?