ELEC
7 - 24
LIGHTING SYSTEM
2. The tail/brake light fails to come on.
1. Tail/brake light bulb and socket
• Check the tail/brake light bulb and socket
for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
• Are the tail/brake light bulb and socket OK?
2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side)
as shown.
Positive tester probe
yellow
Negative tester probe
black
• Set the main switch to “ON”.
• Start the engine.
• Measure the voltage (DC 12 V) of blue
on
the tail/brake light coupler (tail/brake light
side).
• Is the voltage within specification?
Replace the
tail/brake light bulb,
socket or both.
Wiring circuit from
the main switch to
the tail/brake light
coupler is faulty and
must be repaired.
This circuit is OK.
YES
NO
YES
NO
12V5W/21W
1
2
1
2
B
Y
G/Y