On-Vehicle Service; Generator Output Line Voltage Drop Test - Mitsubishi 3000GT Service Manual

GENERATOR OUTPUT LINE VOLTAGE DROP TEST

This test determines whether the wiring from the
generator "B" terminal to the battery (+) terminal
(including the fusible link) is in a good condition
or not.
(1) Always be sure to check the following before
the test.
Generator installation
l
Generator drive belt tension (Refer to
l
GROUP 00 - Maintenance Service.)
Fusible link
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Abnormal noise from the generator while
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the engine is running
(2) Turn the ignition switch to the OFF position.
(3) Disconnect the negative battery cable.
(4) Disconnect the generator output wire from the
generator '73" terminal and connect a DC test
ammeter with a range of 0 - 100 A in series
between the "B" terminal and the disconnected
output wire. (Connect the (+) lead of the amme-
ter to the '73" terminal, and then connect the
ENGINE ELECTRICAL - Charging System
Voltmeter
output wire.)
NOTE
A clamp-type ammeter which enables measure-
ments to be taken without disconnecting the
generator output wire is recommended. The
reason for this is if a vehicle in which the voltage
may have dropped due to an imperfect connec-
tion at the generator "B" terminal is being in-
spected, and the generator "B" terminal is loos-
ened when the test ammeter is connected, the
connection will be completed at this time and
the possibility of finding problems will be re-
duced.
(5) Connect a digital-type voltmeter between the
generator "B" terminal and the battery (+)
terminal. (Connect the (+) lead of the voltmeter
to the "B" terminal, and then connect the (-)
lead of the voltmeter to the battery (+) cable.)
Battery