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CHARGING SYSTEM
REGULATED VOLTAGE TEST
Y27BEOA
The purpose of this test is to check that the electronic voltage
regulator controls the voltage correctly.
Preparation
Load
IGN sw
Ammeter
"
I
Charging
INO lamp
I
....J
=
o
Voltmeter
Fuse
1.
Prior to the test, check the following items and correct if
necessary.
1)
Check the battery installed on the vehicle to see that is
is fully charged. For battery checking method, see the
"BATIERY" section.
2)
Check the alternator drive belt tension.
2.
Turn the ignition switch to "OFF".
3.
Disconnect the battery ground cable.
4.
Connect a digital voltmeter between the "S" terminal of the
alternator and ground. Connect the (+) lead of the voltmeter
to the "S" terminal of the alternator, inserting from the wire
side of the 2-way connector and connect the (-) lead to
ground or the battery (-) terminal.
5.
Disconnect the alternator output wire from the alternator "B"
terminal.
6.
Connect a DC ammeter (0 to 1ooA) in series between the
"B" terminal and the disconnected output wire. Connect the
(+)
lead wire of the ammeter to the alternator "B" terminal
and the (-) lead wire to the disconnected output wire.
7.
Connect an engine tachometer and reconnect the battery
ground cable.
Test
1.
Turn on the ignition switch and check that the voltmeter
indicates battery voltage.
If it reads OV, there is an open circuit in the wire between
the alternator "S" terminal and the battery
(+),
or the fusible
link is blown.
2.
Start the engine. Keep all lamps and accessories off.
3.
Run the engine at a speed of about 2,500 rpm and read the
voltmeter when the alternator output current drops to 10A
or less
27YOOl
Result
1.
If the voltmeter reading agrees with the value listed in the
following table, the voltage regulator is functioning correctly.
If the reading is other than the standard value, the voltage
regulator or the alternator is faulty.
27-8
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