1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 337Get this manual
STARTER SYSTEM
REMOVAL
Remove the front fender to gain access to diode (page 16-1) Open the connector boxRemove the diode from the wire harness
INSPECTION
Check for continuity with an ohmmeterNORMAL DIRECTION: CONTINUITY REVERSE DIRECTION: NO CONTINUITY