Yamaha YP400T Service Manual page 348

EAS00759
4. Starting circuit cut-off relay
• Remove the starting circuit cut-off relay.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starting circuit cut-off
relay terminals as shown.
Positive battery terminal → red/black 1
Negative battery terminal → blue/yellow 2
Positive tester probe → green/yellow 3
Negative tester probe → green/white 4
1
2
L/Y
R/B
• Does the starting circuit cut-off relay have
continuity between
green/white?
YES
ELECTRIC STARTING SYSTEM
3
4
G/W
G/Y
green/yellow and
NO
Replace the starting
circuit cut-off relay.
8 - 17
EAS00761
5. Starter relay
• Remove the starter relay.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starter relay terminal as
shown.
Positive battery terminal →
Negative battery terminal → blue/white 2
Positive tester probe → black 3
Negative tester probe → red 4
• Does the starter relay have continuity
between black and black?
YES
EAS00749
6. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
– +
ELEC
green/yellow 1
NO
Replace the starter
relay.
NO
Replace the main
switch.