Yamaha 2004 YP400 Service Manual page 377

EAS00792
6. The storage box light fails to come on.
1. Storage box light bulb and socket
• Check the storage box light bulb and
socket for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the storage box light bulb and socket
OK?
YES
2. Voltage
• Connect the pocket tester (DC 20 V) to the
storage box light connectors (wire harness
side) as shown.
Positive tester probe → blue/green 1
Negative tester probe → black 2
L/G
1
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of blue/
green 1 on the storage box light connec-
tor (wire harness side).
• Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the storage
box light bulb, socket
or both.
B
2
NO
The wiring circuit
from the main switch
to the storage box
light connector is
faulty and must be
repaired.
LIGHTING SYSTEM
8 - 33
– +
ELEC