I brought my daughter home from college the other day and rode her GS500 part of the way for her. The tachometer and the lights were flickering or shutting off completely while riding and when stopped the engine would either die or almost die every time. I got it home and thought maybe bad battery but it was a 3 hour ride so battery should have charged while i was riding it. Hooked it up to a battery charger and slow charged it till full. She rode it with no problems for 3 days before same problem lights and tach stop working and when she came to a red light it died on her. Can charge the battery to get it around but need to fix this. Any ideas on problem or what to look at would be appreciated.