2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 494Get this manual
ELECTRIC STARTER (TRX450ER) FUNCTION INSPECTION Disconnect the battery negative (-) cable by removing the terminal boltDisconnect the starter relay switch 2P natural connector
Disconnect the battery positive (+) cable and starter motor cable from the starter relay switch
STARTER RELAY SWITCH Connect fully charged 12 battery positive (+) terminal to the Yellowred wire terminal and negative (-) terminal to the Yellowgreen wire terminal of the starter relay switchThere should be continuity between the cable terminals while the battery is connected, and no continuity when the battery is disconnected