Yamaha MM700A Manual page 51

TROUBLESHOOTING
CHARGING SYSTEM
Rectifier
Fuse
Battery
Charge Coil Output Test
The charge coil is contained in the stator behind the fly-
wheel. Refer to Chapter Six.
1. Open the shroud.
2. Connect a tachometer to the engine following the man-
ufacturer's instructions.
3. Switch a voltmeter to the DC20V scale.
COIL
SOURCE TESTS
4. Connect the negative voltmeter lead to the negative
battery terminal and the positive voltmeter lead to the pos-
itive battery terminal. See Figure 12.
5. Start the engine. Gradually increase engine speed to
3000 rpm and note the voltmeter reading. The correct
reading is 13.3-14.3 volts. If meter reading is less than
specified, check the charging coil resistance as described
in this chapter. If the charging coil resistance is correct
and charging system troubles remain, the rectifier is prob-
ably damaged. Replace it as described in Chapter Six.
Charging Coil Resistance Test
1. Open the shroud.
2. Disconnect the rectangular six-wire connector located
near the CDI box.
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