2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 493Get this manual
ELECTRIC STARTER (TRX450ER)
STARTER RELAY SWITCH
OPERATION INSPECTION
Shift the transmission into neutralTurn the ignition switch to ON and push the starter switchThe coil is normal if the starter relay switch clicksIf you don't hear the switch click, and inspect the relay switch circuits (page 23-13)STARTER RELAY SWITCH