2003 Honda ATV TRX650FA Rincon Factory Service Manual, Page 412Get this manual
BATTERYCHARGING SYSTEM
REGUlATORIRECTIFIER
W IRE HA RNESS INSPECTION
Remov th two bolts and regul at rrecti fi erDi sconn ect th regu lat orrectifi er 3P ray and la ck con nectarsChec th co ne ctors for lo se co ntacts co ro ded ermi nal s
BATTERY LINE
Measu re he vo ltage bet en th Red ire termi nal nd grou nd There shou ld be ba ttery vo lta ge at al imes