Yamaha MBK YQ100 Service Manual page 213

4.The taillight does not work.
1.Bulb and socket.
Refer to " SWITCH INSPECTION " section.
2.Voltage
• Connect the pocket tester (AC 20 V) to the
taillight connectors.
Pocket tester (+) lead → → → → → Blue/Red
Pocket tester (-) lead → → → → → Black
• Set the main switch to "ON".
• Start the engine.
• Set the light switch to "
• Check for voltage (12 V) to the taillight
coupler.
Circuit is in good condition.
4.The license light does not work.
1.Bulb and socket.
Refer to " SWITCH INSPECTION " section.
CONTINUITY
" or " ".
MEETS
SPECIFICATION
CONTINUITY
7-26
LIGHTING SYSTEM
NO CONTINUITY
Replace bulb or socket.
OUT OF SPECIFICATION
There is a defect in the wire harness between
the main switch and the taillight connectors
→ Repair.
NO CONTINUITY
Replace bulb or socket.
ELEC
LR LR
GY GY
B B
12V
21W / 5W
B