Yamaha 2004 YP400, Service Manual, Page: 360 / 417

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ELEC
ELECTRIC STARTING SYSTEM
EAS00757
TROUBLESHOOTING
Check:
1. main, ignition, and signaling system fuses
2. battery
3. starter motor
4. starting circuit cut-off relay
5. starter relay
6. main switch
7. engine stop switch
8. brake light switch (front and rear)
9. sidestand switch
10.start switch
11.wiring connections
(of the entire starting system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. storage box
2. front cowling
• Troubleshoot with the following special
tool(s).
EAS00738
YES
NO
EAS00739
YES
NO
EAS00758
YES NO
The starter motor fails to turn.
Pocket tester
90890-03112, YU-03112-C
1. Main, ignition, and signaling system fuses
• Check the main, ignition, and signaling
system fuses for continuity.
Refer to “CHECKING THE FUSES” in
chapter 3.
• Are the main, ignition, and signaling sys-
tem fuses OK?
Replace the fuse(s).
2. Battery
• Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
• Is the battery OK?
• Clean the battery
terminals.
• Recharge or
replace the battery.
3. Starter motor
• Connect the positive battery terminal
1
and starter motor lead
2
with a jumper
lead
3
.
WARNING
_
• A wire that is used as a jumper lead
must have at least the same capacity or
more as that of the battery lead, other-
wise the jumper lead may burn.
• This check is likely to produce sparks,
therefore make sure nothing flammable
is in the vicinity.
• Does the starter motor turn?
Repair or replace the
starter motor.