Yamaha T135SE Service Manual page 330

3. Voltage
9Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness side)
as shown.
Neutral indicator light
Positive tester probe → → sky blue 1 1
Negative tester probe → → ground
1st gear position indicator light
Positive tester probe → → white 2 2
Negative tester probe → → ground
2nd gear position indicator light
Positive tester probe → → pink 3 3
Negative tester probe → → ground
3rd gear position indicator light
Positive tester probe → → yellow/white 4 4
Negative tester probe → → ground
4th gear position indicator light
Positive tester probe → → blue/white 5 5
Negative tester probe → → ground
9Set the main switch to "ON".
9Shift the transmission into each gear.
9Measure the voltage (DC 12 V) of the sky
blue 1, white 2, pink 3, yellow/white 4, or
blue/white 5 lead terminal at the meter
assembly coupler (wire harness side).
9Is the voltage within specification?
YES
This circuit is OK.
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Yamaha T135 Service Manual
Br L L Br
Dg Dg
Ch Ch
G B B G
1
Sb Y/W Y/W Sb
W G/W G/W W
P L/W L/W P
2
5 3
4
NO
The wiring circuit
from the main
switch to the meter
assembly coupler
is faulty and must
be repaired.
8-38
SIGNALING SYSTEM
EAS00804
5. The fuel level gauge fails to operate.
1. Fuel sender
9Remove the fuel sender from the fuel tank.
9Connect the pocket tester to the fuel sender
coupler (fuel sender side) as shown.
Positive tester probe → → green 1 1
Negative tester probe → → black 2 2
9Measure the fuel sender resistances.
Fuel sender resistance
(up position å å )
(Ω × × 1)
4–10 Ω at 20°C (68°F)
Fuel sender resistance
(down position ∫ ∫ )
(Ω × × 10)
90–100 Ω at 20°C (68°F)
9Is the fuel sender OK?
YES
ELEC
1 2
B G
å
∫
NO
Replace the fuel
sender.