Yamaha YFM50S Service Manual page 219

EBS01054
5. Starter relay
• Disconnect the starter relay coupler from
the coupler.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starter relay coupler as
shown.
Positive battery terminal → blue/white 1
Negative battery terminal → red/white 2
Positive tester probe → red 3
Negative tester probe → black 4
3
R
B
4
• Does the starter relay have continuity
between red and black?
YES
EBS01041
6. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
ELECTRIC STARTING SYSTEM
1
L/W
R/W
2
NO
Replace the starter
relay.
NO
Replace the main
switch.
8 - 16
EBS01046
7. Neutral switch
• Check the neutral switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the neutral switch OK?
YES
8. Rear brake switch
• Check the rear brake switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the rear brake switch OK?
YES
EBS01057
9. Start switch
• Check the start switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the start switch OK?
YES
– +
ELEC
NO
Replace the neutral
switch.
NO
Replace the rear
brake switch.
NO
Replace the handle-
bar switch.