Yamaha YJ125S, Service Manual, Page: 269 / 294

7-31
- +
ELEC
LIGHTING SYSTEM
2. Voltage
8
Connect the pocket tester (DC 20 V) to
the meter light coupler (wire harness
side) as shown.
Positive tester probe
J J J J J
blue
1 1 1 1 1
Negative tester probe
J J J J J
black
2 2 2 2 2
8
Set the main switch to “ON”.
8
Measure the voltage (DC 12 V) of blue
1
on the meter light coupler (wire har-
ness side).
8
Is the voltage within specification?
YES NO
EAS00789
2. The meter light fails to come on.
1. Meter light bulb and socket
8
Check the meter light bulb and socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
8
Are the meter light bulb and socket OK?
YES NO
Replace the meter light
bulb, socket or both.
This circuit is OK.
The wiring circuit
from the main
switch to the meter
light coupler is faulty
and must be re-
paired.
Refer to “CIRCUIT
DIAGRAM”.
EAS00841
3. Fuel level meter light
8
Check the fuel level meter light bulb and
socket for continuity.
8
Are the fuel level meter light bulb and
socket OK?
YES NO
Replace the fuel level
meter light bulb, socket or
both.
Ch
L
B
L
Dg
B Ch
Dg
2
Y
1