2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 348Get this manual
SIGNAL SYSTEM ELEC
Turn the main switch to "ON"Check the voltage (12 V)MEETS SPECIFICATION
OUT OF SPECIFICATION
This circuit is not faulty
The wiring circuit from the main switch to the bulb socket connector is faulty, repair it
4.If the park indicator light fails to come on: 1.Bulb and bulb socket
Check the bulb and bulb socket for continuityCONTINUITY
NO CONTINUITY