D439E Service Manual 3. Engine Electrical System (D439E)
132
Adjustment
Voltage Drop Test of Alternator Output Wire
This is a test to check the wiring between" B"
terminal of alternator and (+) terminal of battery.
1. Preparation works
1) Turn tile Ignition switch off.
2) Remove the ground cable of the battery.
3) Disconnect the alternator output wire from the
“B" terminal of alternator.
4) Connect a DC ammeter (O~150A) between “B"
terminal and the disconnected output Wile
Connect the (+) and (-) lead wires of the
ammeter to" B" terminal and the disconnected
output wire, respectively.
CAUTION
If clamp type ammeter is used, current can be
measured without disconnecting the harness.
5) Connect a digital voltmeter between alternator
“B" terminal and (+) terminal of the battery.
Connect tile (+) and (-) lead wires of the
voltmeter to “B" terminal and (-) terminal of the
battery, respectively.
6) Connect the battery ground cable.
2. Test
1) Start the engine.
2) With turning ON/OFF the headlight adjust the
engine speed as the ammeter indicator points
20A. At that time, measure the voltage.
3. Result
1) It is normal If the measured voltage is Within
the specification.
Test Reference voltage : Max 0.2V.
2) If the measured voltage exceeds the reference
wiring may be defective Therefore check the
wiring between" B" terminal of the alternator
and fusible link and between alternator and
terminal of the battery.
3) In addition, before the secondary test, check
the looseness at the connection and the
discoloration of harness due to the overheating
Repair them.
4) Turn the light and Ignition switch "OFF" after
the test.
5) Disconnect the battery ground cable.
6) Disconnect the ammeter and voltmeter used for
the test.
7) Connect the alternator output lead wire to the
“B" terminal of the alternator.
8) Connect the battery ground cable.
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