2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 275Get this manual
ELECTRIC STARTER
NEUTRAL INDICATORGEAR POSITION SWITCH
NEUTRAL INDICATOR INSPECTION
Shift the transmission in neutral position and turn the ignition switch to ONCheck the neutral indicatorIf the neutral indicator does not light, check the indicator bUlbIf the indicator bulb has no problemcheck the gear position switchNEUTRAL INDICATOR