Yamaha YFM250XL(C) Service Manual page 297

EB805020
LIGHTING SYSTEM CHECK
1.If the headlights fail to come on:
1.Bulb and bulb socket
Check the bulb and bulb socket for conti-
nuity.
2.Voltage
Connect the pocket tester (DC 20 V) to
the headlight couplers.
Å ı
Tester (+) lead →
Green terminal 1 or Yellow terminal 2
Tester (–) lead → Black terminal 3
Å
When the lights switch is on "LO".
ı
When the lights switch is on "HI".
Turn the main switch to "ON".
Turn the lights switch to "LO" or "HI".
Check the voltage (12V) of the "Green"
and "Yellow" leads on the bulb socket
connector.
This circuit is not faulty.
LIGHTING SYSTEM
CONTINUITY
MEETS
SPECIFICATION
8 - 27
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
8