2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 158Get this manual
Starter does not turn Ignition switch is in the OFF positionBurnt fuseTransmission is not set on the Park or NeutralPoor contact of battery terminal(s) or ground cable connectionsWeak batteryPoor contact or open circuit of: start stop switch or start button and engine stop switch, ignition switch or starting solenoidNEUTRAL or PARK switches are defectiveEngine mechanical problem (ensure that other electric components are good)
Turn switch in the ON positionCheck main fuse and wiring conditionSet transmission either in Park or Neutral or use the override modeClean and tighten terminal(s)Recharge batteryCheck and replace defective part
Check NEUTRAL or PARK switches and wiring conditionCommunicate with the Service RepresentativeClean and tighten terminal(s)Clean and tightenReplace starting solenoidStraighten commutator and brush or replace electric starterTurn commutator in lathe or replace electric starterUndercut mica or replace electric starterReplace electric starterReplace electric starterReplace electric starterReplace electric starterRecharge or replace batteryReplace starter drive pinionReplace starter drive pinionReplace starter drive pinionReplace starter drive pinionRecharge ring gear