Yamaha Scorpio Service Manual page 248

2.Brake light does not come on.
1.Bulb and bulb socket
Check the bulb and bulb socket for continu-
G
ity.
Refer to the "CHECKING OF BULBS" sec-
tion.
2.Brake switch
Check the brake switches for continuity.
G
Refer to the "CHECKING THE
SWITCHES" section.
3.Voltage
Connect the pocket tester (DC 20 V) to the
G
bulb socket connector.
Tester (+) lead → Yellow 1 terminal
Tester (–) lead → Black 2 terminal
Turn the main switch to "ON".
G
The brake level is pulled in or brake pedal
G
is stopped down.
Check for voltage (12 V) on the "Yellow"
G
lead at the bulb socket connector.
This circuit is good.
CONTINUITY
CORRECT
MEETS SPECIFI-
CATION (12 V)
7 - 40
SIGNALING SYSTEM
NO CONTINUITY
Bulb and/or bulb socket are faulty, replace.
INCORRECT
Brake switch is faulty, replace it.
OUT OF SPECIFICATION
Wiring circuit from main switch to bulb socket
connector is faulty, repair.
– +
ELEC