Yamaha YFM4FAR Service Manual page 370

3.If the reverse indicator light fails to come on:
1.Bulb and bulb socket
Check the bulb and bulb socket for
G
continuity.
2.Reverse switch
Refer to "CHECKING THE SWITCHES".
3.Voltage
Connect the pocket tester (DC 20 V) to the
G
bulb socket coupler.
Tester (+) lead → Red/White terminal 1
Tester (–) lead → Green/Blue terminal 2
Turn the main switch to "ON".
G
Check the voltage (12 V).
G
Replace the CDI unit.
CONTINUITY
CONTINUITY
MEETS
SPECIFICATION
9 - 37
SIGNAL SYSTEM
NO CONTINUITY
Replace the bulb and/or bulb socket.
NO CONTINUITY
Replace the reverse switch.
OUT OF SPECIFICATION
The wiring circuit from the main switch to the
bulb socket connector is faulty, repair it.
– +
ELEC