Yamaha YJ50RAP Service Manual page 205

2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe → blue 1
Negative tester probe → black 2
Y
B
• Set the main switch to "ON".
• Measure the voltage (12 V) of blue 1 on
the tail/brake light coupler (tail/brake light
side).
• Is the voltage within specification?
YES
This circuit is OK.
1
L L
G/Y
B
2
NO
The wiring circuit
from the main
switch to the tail/
brake light coupler
is faulty and must
be repaired.
LIGHTING SYSTEM
7 - 28
– +
ELEC