2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 291Get this manual
CHARGING SYSTEM EBS01065 EBS01044
TROUBLESHOOTING The battery is not being chargedCheck: 1fuse 2battery 3charging voltage 4stator coil resistance 5wiring connections (of the entire charging system) NOTE: Before troubleshooting, remove the following part(s): 1seat 2front panel 3front fender 4rear fender 5side cover Troubleshoot with the following special tool(s)Pocket tester 90890-03112 Analog pocket tester YU-03112-C