Yamaha FZ6-ST Supplementary Service Manual page 430

EAS00774
TROUBLESHOOTING
The battery is not being charged.
Check:
1. main fuse
2. battery
3. charging voltage
4. stator coil lead
5. stator coil resistance
6. wiring connections
(of the entire charging system)
NOTE:
S Before troubleshooting, remove the following
part(s):
1. seat
2. front cowling inner panel (left and right)
3. fuel tank
S Troubleshoot with the following special tool(s).
Pocket tester
90890-03112, YU-3112
EAS00738
1. Main fuse
S Check the main fuse for continuity.
Refer to "CHECKING THE FUSES" in chap-
ter 3.
S Is the main fuse OK?
YES
EAS00739
2. Battery
S Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
NO
Replace the fuse.
8-25
CHARGING SYSTEM
Minimum open-circuit voltage
12.8 V or more at 20_C (68_F)
S Is the battery OK?
YES
EAS00775
3. Charging voltage
S Set the engine tachometer to the ignition coil
of cylinder #1.
S Connect the pocket tester (DC 20 V) to the
battery as shown.
Positive tester probe !
Negative tester probe !
negative battery terminal
S Start the engine and let it run at approxi-
mately 5,000 r/min.
S Measure the charging voltage.
Charging voltage
14 V at 5,000 r/min
NOTE:
Make sure the battery is fully charged.
S Is the charging voltage within specification?
NO
ELEC
NO
S Clean the battery
terminals.
S Recharge or re-
place the battery.
positive battery terminal
YES
The charging circuit
is OK.