Hyundai Sonata 1991 Shop Manual page 124

CHARGING SYSTEM
SERVICE ADJUSTMENT PROCEDURES
Y27BCOA
VOLTAGE DROP TEST OF ALTERNATOR OUTPUT
WIRE
Battery
Ammeter
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1. Turn the ignition switch to "OFF".
2. Disconnect the battery GND cable.
3. Disconnect the alternator output lead from the alternator "B"
terminal.
4. Connect a DC ammeter (0 to 1OOA) in series to the "B"
terminal and the disconnected output lead. Connect the (+)
lead of the ammeter to the "B" terminal and the (-) lead
to the disconnected output wire.
Preparation
This test determines whether or not the wIring between the
alternator B terminal and the battery (+) terminal' (including
fusible link) is within specifications.
NOTE:
Use of an inductive type ammeter that measures current
without disconnecting the harness is preferred. The reason
is that, while checking a vehicle that has low output
current due to a poor connection of the alternator "B"
terminal, when the terminal is loosened and a test
ammeter is connected, the poor connection will be
corrected. As a result, the cause may not be determined.
29YQ16
5. Connect a voltmeter between the alternator "B" terminal and
battery
(+)
terminal. Connect the
(+)
lead wire of the voltmeter
to the "B" terminal and the (+) lead wire to the battery (-)
terminal.
6.
Connect the battery ground cable.
Test
1. Start the engine.
2. Turn the headlamps ON and OFF. Adjust the engine speed
so that the ammeter reads 20A and note the reading of the
voltmeter.
Result
1. The reading should be less than the standard value.
Standard value : 0.2V max.
2. If the voltmeter indicates a value larger than the standard
value, poor wiring can be suspected.
The wiring from the alternator "B" terminal to the fusible link
and battery (+) terminal. Check for corroded or loose
connections.
27-5