Regulated Voltage Test; Voltage Regulation Table - Mitsubishi 3000GT Service Manual

REGULATED VOLTAGE TEST

This test determines whether the voltage regulator
is correctly controlling the generator output voltage.
(1) Always be sure to check the following before
the test.
Generator installation
l
Check to be sure that the battery installed
l
in the vehicle is fully charged. (Refer to
GROUP 54 - Battery.)
Generator drive belt tension (Refer to
l
GROUP 00 - Maintenance Service.)
Fusible link
l
Abnormal noise from the generator while
l
the engine is running
(2) Turn the ignition switch to the OFF position.
(3) Disconnect the negative battery cable.
(4) Connect a digital-type voltmeter between the
generator "S" terminal and the ground. (Connect
the (+) lead of the voltmeter to the "s" terminal,
and then connect the (-) lead of the voltmeter
to a secure ground or to the battery (-) terminal.)
(5) Disconnect the generator output wire from the
generator "B" terminal.
(6) Connect a DC test ammeter with a range of
the disconnected output wire. (Connect the
and then connect the (-) lead of the ammeter
to the disconnected output wire.)
(7) Connect a tachometer. (Refer to GROUP 11
(8) Reconnect the negative battery cable.

VOLTAGE REGULATION TABLE

Inspection Voltage regula-
terminal tor
temperature
-20 (-4)
Terminal "S"
20 (68)
ENGINE ELECTRICAL - Charging Svstem
Generator
Standard value Inspection
ambient (V)
14.2-15.4
13.9-14.9
TSB Revision
Ammeter
(9) Turn the ignition switch to the ON position and
check that the reading on the voltmeter is equal
to the battery voltage.
NOTE
If the voltage is 0 V, the cause is probably an
open circuit in the wire or fusible link between
the generator "S" terminal and the battery (+)
terminal.
are off.
(11) Start the engine.
(12)lncrease the engine speed to 2,500 r/min.
the current output by the generator becomes
(14)lf the voltage reading conforms to the value
in the voltage regulation table, then the voltage
regulator is operating normally.
If the voltage is outside the standard value,
there is a malfunction of the voltage regulator
or of the generator.
idle speed.
(16)Turn the ignition switch to the "OFF" position.
tachometer.
(19)Connect the generator output wire to the
generator "B" terminal.
(20)Connect the negative battery cable.
Voltage regula- Standard value
terminal tor
temperature
Terminal "S"
60 (140)
80 (176)
ambient (V)
13.4-14.5