Yamaha YFM50S Service Manual page 218

EBS01053
4. Starting circuit cut-off relay
First step:
• Disconnect the starting circuit cut-off relay
coupler from the wire harness.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starting circuit cut-off
relay coupler as shown.
Positive battery terminal → red/white 1
Negative battery terminal →
Positive tester probe → red/white 1
Negative tester probe → blue/white 3
2
B/Y
Sb
• Does the starting circuit cut-off relay have
continuity between red/white and blue/
white?
ELECTRIC STARTING SYSTEM
black/yellow 2
1
3
L/W
R/W
8 - 15
Second step:
• Connect the pocket tester (Ω × 1) to the
starting circuit cut-off relay coupler as
shown.
• Measure the starting circuit cut-off relay for
continuity as follows.
Positive tester probe →
sky blue 4
Negative tester probe →
black/yellow 5
Positive tester probe →
black/yellow 5
Negative tester probe →
sky blue 4
4
5
B/Y
Sb
NOTE:
_
When you switch the tester's positive and
negative probes, the readings in the above
chart will be reversed.
• Are the testing readings correct?
YES
– +
ELEC
Continuity
No
continuity
L/W
R/W
NO
Replace the starting
circuit cut-off relay.