Check Discharge Warning Light Circuit; Check Charging Circuit Under No Load - Yanmar 6LPA-STP2 Service Manual

Test and Inspection
12/05
Check Discharge Warning Light
Circuit
1. Set the start switch to ON and check that the
discharge warning light turns on.
2. Start the engine and check that the discharge
warning light turns off. If the light fails to
operate, repair as necessary.
Check Charging Circuit Under No
Load
1. Connect a voltmeter and ammeter to the
charging circuit as illustrated in (Figure 11-6).
NOTICE: NEVER operate the engine with the
batteries disconnected. Damage to the
alternator will result.
Figure 11-6
(2)
(6)
(1)
Figure 11-6
1 – Battery
2 – Ammeter
3 – Disconnect lead from terminal B at this
point
4 – Terminal B
5 – Alternator
6 – Voltmeter
2. Disconnect the lead from alternator terminal B
and connect to the negative (-) lead of
ammeter.
3. Connect the positive (+) lead of ammeter to the
alternator terminal B.
6LPA Service Manual
(3)
(4)
(5)
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© 2007 Yanmar Marine International
4. Connect the positive (+) lead of voltmeter to the
alternator terminal B.
5. Connect the negative (-) lead of voltmeter to the
ground.
6. Start the engine and let it run for a few minutes
before carrying out the test.
7. Increase the engine speed to 2000 rpm, and
record voltage and current output readings.
No load:
• Standard Current - 10A or less
• Standard Voltage - 14.0 to 15.0V at 25°C
(77°F) - 13.5 to 14.3V at 115°C (239°F)
• If the voltmeter reading exceeds the standard
value, replace the IC regulator.
• If the voltmeter reading is below the specified
value, check the IC regulator and alternator as
instructed in step 8.
8. Ground terminal F (Figure 11-7, (1)), start the
engine and check the voltmeter reading at
terminal B.
• If the voltmeter reading exceeds the standard
value, replace the IC regulator.
• If the voltmeter reading is below the specified
value, check the alternator.
Figure 11-7
(1)
Figure 11-7
ALTERNATOR
0004830
11-9