Yamaha CS50 User Manual

ELEC
SIGNALING SYSTEM
8-32
• Set the main switch to “ON”.
• Set the turn signal switch to “L” or “R”.
• Measure the voltage (DC 12 V) of the cho-
colate  or dark green 2 at the turn signal
light connector (wire harness side).
• Is the voltage within specification?
EAS00802
4. The oil level warning light fails to come on.
1. Oil level warning light bulb and socket
• Check the oil level warning light bulb and
socket for continuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”
• Are the oil level warning light bulb and soc-
ket OK?
2. Engine oil level switch
• Drain the engine oil and remove the engine
oil level switch from the oil pan.
• Check the engine oil level switch for conti-
nuity.
Refer to “CHECKING THE SWITCHES”.
• Is the engine oil level switch OK?
3. Voltage
• Connect the pocket tester (DC 20 V) to the
meter coupler (wire harness side) as
shown.
Positive tester probe

green/yellow 
Negative tester probe

black 
• Set the main switch to “ON”.
• Measure the voltage (DC 12 V) of
green/yellow  and black  at the meter
coupler.
• Is the voltage within specification?
EAS00804
5. The fuel level gauge fails to operate.
1. Fuel sender
• Remove the fuel sender from the fuel tank.
• Connect the pocket tester to the fuel sen-
der coupler (wire harness side) as shown.
Positive tester probe

green 
Negative tester probe

sky blue 
The wiring circuit
from the turn signal
switch to the turn
signal light connec-
tor is faulty and
must be repaired.
This circuit is OK.
Replace the oil level
warning light bulb,
socket or both.
Replace the engine
oil level switch.
LY
Br
Ch Dg
RB
Gy GR
BY Sb G LG
Dg Ch L GR Y Gy
RBrBBYSbG
RY
RYLG
1
2
B
G
/
Y
The wiring circuit
from the main
switch to the meter
coupler is faulty
and must be
repaired.
This circuit is OK.
1
2
GSb
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)