Yamaha YW50AP Service Manual page 195

YP806022
2. If the brake light fails to come on:
1. Bulb and bulb socket
Refer to "CHECKING SWITCHES" section.
2. Brake switch (Front/Rear)
Refer to "CHECKING SWITCHES" section.
3. Voltage
8 Connect the pocket tester (DC20V) to the
bulb socket connector.
Tester (+) leadGGreen/Yellow terminal 1
Tester (-) leadGBlack terminal 2
8 Turn the main switch to on.
8 The brake lever is pulled in.
8 Check for voltage (12V) of the "Green/Yel-
low" lead on the bulb socket connector.
This circuit is not faulty.
CONTINUITY
CONTINUITY
1
G/Y Br
B
-
Ch Dg
2
MEETS
SPECIFICATION
7-37
SIGNAL SYSTEM
NO CONTINUITY
Replace the bulb and/or bulb socket.
NO CONTINUITY
Replace brake switch.
OUT OF SPECIFICATION
4. Wiring connection
8 Wiring circuit from the main switch to the
bulb socket connector is faulty. Repair.
Refer to "SIGNAL SYSTEM WIRING DIA-
GRAM " .
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ELEC