Yamaha XT660R Service Manual page 428

3. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness
end) as shown.
Positive tester probe → green/white 1
Negative tester probe → black/white 2
Ch R/G Y
Dg G/L R/W
G G/L R/W
Ch R/G Y
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of green/
white 1 and black/white 2 at the meter
assembly coupler.
• Is the voltage within specification?
YES
This circuit is OK.
G/W Y/L
B/W Lg
B/W Lg
G/W Y/L
NO
The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be
repaired.
SIGNALING SYSTEM
6. The speedometer fails to come on.
1. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness
end) as shown.
Positive tester probe → yellow/blue 1
Negative tester probe → black/white 2
• Set the main switch to "ON".
• Elevate the rear wheel and slowly rotate it.
• Measure the voltage (DC 5 V) of yellow/
blue 1 at the meter assembly coupler
(wire harness end).
• Is the voltage within specification?
8 - 46
ELEC
Ch R/G Y G/W Y/L
Dg G/L R/W B/W Lg
G G/L R/W B/W Lg
Ch R/G Y G/W Y/L
YES
Replace the meter
assembly.
– +
NO