SECTION 55 - ELECTRICAL SYSTEM
55-129
3. With the test ammeter terminals short-circuited,
start the engine.
CAUTION
In the case of where the test ammeter is
connected at the position shown in Figure 181,
make sure no starting current is applied to the
ammeter when the engine is started.
4. Remove the short circuit across the test ammeter
terminals and increase the engine speed
immediately to approximately 2000 RPM. Take
the ammeter reading.
5. If the ammeter reading is 5A or less, take the
voltmeter reading without changing the engine
speed (approximately 2000 RPM). The reading
is the adjusting voltage.
6. If the ammeter reading is more than 5A, continue
to charge the battery until the reading falls to less
than 5A or replace the battery with a fully charged
one.
An alternative method is to limit the charging
current by connecting a 1/4 (25W) resistor in
series with the battery.
Checking Output
If the previous section “A” check is satisfactory, check
the output as follows:
1. After opening the battery switch, disconnect
terminal B of the alternator and connect an
ammeter (50-amp capacity) at the position
shown.
2. Connect the voltmeter between terminal B of the
alternator and the ground. Confirm the voltmeter
indicates the battery voltage.
3. Close the key switch.
4. Start the engine and turn on all the lamps.
Immediately accelerate the engine to 2000 RPM
or more and measure the maximum value
indicated on the ammeter.
5. If this value is more than 70% of the nominal
output (refer to the section on “Service
Specifications”), the alternator can be
considered as working almost satisfactorily.
NOTE: To make the above judgement more
accurate, remove the alternator from the engine and
check it on a test bench.
177
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