Yamaha YFM660RN Service Manual page 307

EB805021
2.If the tail/brake light fails to come on:
1.Bulb and bulb socket
Check the bulb and bulb socket for continu-
ity.
2.Voltage
Connect the pocket tester (20 V) to the bulb
socket coupler.
Tester (+) lead → Blue terminal 1
Tester (–) lead → Black terminal 2
Turn the main switch to "ON".
Turn the lights switch to "LO" or "HI".
Check the voltage (12 V) of the "Blue" lead
on the bulb socket connector.
This circuit is not faulty.
CONTINUITY
MEETS
SPECIFICATION
8 - 26
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