2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 453Get this manual
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21BATTERYCHARGING SYSTEM (After '05)
21-2 21-2 21-3 21-5 21-6
CHARGING SYSTEM INSPECTION (TRX450ER) REGULATORRECTIFIER GENERATING SYSTEM ALTERNATOR 21-7 21-8 21-9 21-10