Yamaha 2012 Grizzly 300 Service Manual page 289

2. The tail/brake light fails to come on.
1. Tail/brake light bulb and bulb 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?
YES
2. Voltage
• Connect the pocket tester (AC 20 V) to the
tail/brake light coupler as shown.
Tail/brake light coupler (wire harness side)
Tail/brake light
Positive tester probe → yellow
Negative tester probe → black
G
Y
G/Y
• Set the main switch to "ON".
• Start the engine.
• Measure the voltage (AC 12 V) of yellow
on the tail/brake light coupler (wire har-
ness side).
• Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the tail/brake
light bulb, socket or
both.
1
2
2
B
Y G/Y
1
1
NO
Replace the rectifier/
regulator.
9-22
LIGHTING SYSTEM
ELEC
– +