Yamaha CS50 User Manual

ELEC
LIGHTING SYSTEM
8-25
• Set the main switch to “ON”.
• Start the engine.
• Measure the voltage (DC 12 V) of blue  on
the meter light coupler (wire harness side).
• Is the voltage within specification?
EAS00790
3. 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

blue 
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?
EAS00791
4. The position light fails to come on.
1. Position light bulb and socket
• Check the position light bulb and socket for
continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
• Are the position light bulb and socket OK?
2. Voltage
• Connect the pocket tester (DC 20 V) to the
position light coupler (wire harness side) as
shown.
Positive tester probe

blue 
Negative tester probe

black 
The wiring circuit
from the main
switch to the meter
light coupler is
faulty and must be
repaired.
This circuit is OK.
Replace the
tail/brake light bulb,
socket or both.
L
G/Y
B
1
2
Wiring circuit from
the main switch to
the tail/brake light
coupler is faulty and
must be repaired.
This circuit is OK.
Replace the posi-
tion light bulb,
socket or both.
L
B
L
B
1
2
YES
NO
YES
NO
YES
NO
YES
NO

Yamaha CS50 Specifications

General

Fuel Capacity	4.5 liters
Fuel System	Carburetor
Cooling	Air-cooled
Transmission	Automatic
Starting System	Kick start
Brakes	Drum brakes (front and rear)