2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 484Get this manual
ELECTRIC STARTER (TRX450ER)
TROUBLESHOOTING
NOTE: The starter motor should operate when the transmission is in neutral or when the transmission is into gear and the clutch lever is squeezedStarter Motor Does Not Turn 1Fuse Inspection Check for blown main fuse (15 A)Is the fuse blown? YES NOReplace the fuse- GO TO STEP 2
2Battery Inspection Check that the battery is fully charged and in good conditionIs the battery in good condition? YES NOGO TO STEP 3- Charge the battery (page 21-7)
3Starter Relay Switch Operation Inspection Check the operation of the starter relay switch (page 23-13)Does the starter relay switch click? YES NOGO TO STEP 4- GO TO STEP 5
4Starter Motor Inspection Turn the ignition switch to OFFApply battery voltage to the starter motor directlyDoes the starter motor turn? YES NOPoorly connected starter motor cable Faulty starter relay switch (page 23-13)- Faulty starter motor (page 23-6)5Relay Coil Ground Line Inspection Turn the ignition switch to OFFCheck the ground line of the starter relay switch (page 23-13)Is the ground line normal? NOFaulty clutch switch (page 24-8)Faulty neutral switch (page 24-10)Faulty diode (page 23-14)Loose or poor contact of the related connector terminalOpen circuit in the wire harness