Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 445

EB805021
2.If the taillight fails to come on:
1.Bulb and bulb socket
Check the bulb and bulb socket for continu-
G
ity.
2.Voltage
Connect the pocket tester (20 V) to the bulb
G
socket coupler.
Tester (+) lead → Blue lead
Tester (–) lead → Black lead
Turn the main switch to "ON".
G
Turn the lights switch to "LO" or "HI".
G
Check the voltage (12 V) of the "Blue" lead
G
on the bulb socket connector.
This circuit is not faulty.
CONTINUITY
MEETS
SPECIFICATION
9 - 31
LIGHTING SYSTEM
NO CONTINUITY
Replace the bulb and/or bulb socket.
OUT OF SPECIFICATION
The wiring circuit from the main switch to the
bulb socket connector is faulty, repair it.
– +
ELEC