Yamaha YQ50 Service Manual page 179

3. Voltage
• Connect the pocket tester (DC20V) to the
bulb socket connector.
Pocket tester (+) lead © Grey Q
Pocket tester (-) lead © Ground
• Turn the main switch to ON.
• Check the voltage (12V) between "Grey" and
the ground.
This circuit is in good condition.
5.The fuel meter does not work.
1.Fuel sender unit
• Disconnect the fuel sender leads.
• Connect the pocket tester (Ω x 100) then
(Ω x 10) to the fuel sender.
• Drain the fuel tank.
• Measure the resistance.
Sender unit resistance
(empty tank):
Ω
90 ~ 100
• Fill the tank.
• Measure the resistance.
Sender unit resistance
(full tank):
1.5 ~ 7.5
This circuit is in good condition.
Y
Y Dg Dg
Ch Ch
Gy Gy
Gy Gy
Dg Dg
Br Br
Ch Ch
YR YR
MEET
SPECIFICATION
° °
at 20 C (68 F)
Ω ° °
at 20 C (68 F)
MEET
SPECIFICATION
SIGNAL SYSTEM
DOES NOT MEET SPECIFICATION
4. Connections
• Check all connections in the signal system.
Refer to "WIRING DIAGRAM".
DOES NOT MEET SPECIFICATION
Replace the fuel sender.
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