Honda TRX450R Service Manual page 495

ELECTRIC STARTER (TRX450ER)
Disconnect the neutral switch connector (page 24-
10).
Check for continuity between the Yellow/green wire
harness side connector and Light green/red wire
harness side connector.
When there is continuity, a small resistance value
will register.
If there is continuity in one direction, the diode is
normal.
NEUTRAL SWITCH
CONNECTOR ("N"
23-15