1989-Montero · Система зарядки · страница 7 из 17 · Открыть оригинал PDF ↗
meter to the “B” terminal and the (-) lead to
the disconnected output wire.
NOTE -
sdu”;~’ ADJUSTMENT PROCE- NaaELAb
Use of. a clamp type ammeter that can mea-
sure current without disconnecting the harness
is preferred. The reason is that when checking
a vehicles that has a low output current due to
poor connection of the alternator “B” terminal,
such poor connection is corrected as the “B”
terminal is loosened and a test ammeter is
connected in its place and as a result, causes
for the trouble may not be determined.
CHARGING SYSTEM INSPECTION
VOLTAGE DROP TEST OF ALTERNATOR OUT- PUT WIRE
This test judges whether or not the wiring (includ-
ing the fusible link) between the alternator “B”
terminal and the battery (+) terminal is sound by
the voltage drop method.
Preparation
(5) Connect a digital voltmeter between the alter-
nator “B” terminal and battery (+) terminal.
Connect the (+) lead wire of the voltmeter to
the “B” terminal and the (-) lead wire to the
battery (+) terminal.
(1) Turn the ignition switch to “OFF”.
(2) Disconnect the battery ground cable.
(3) Disconnect the alternator output lead from the
alternator “B” terminal.
(4) Connect a DC ammeter (0 to 100 A) in series
to the “B” terminal and the disconnected
output lead. Connect the (+) lead of the am-
(6) Connect the batterv around cable.
(7) Leave the hood opo<
Test
(1) Start the engine.
(2) Turn on or off the headlights and small lights
and adjust the engine speed so that the am-
meter reads 20A and read off the voltmeter
indication under this condition.
Result
(1) It is okay if the voltmeter indicates the stan-
dard value.
Standard value: 0.2V max.
(2) If the voltmeter indicates a value that is larger
than the standard value, poor wiring is sus-
pected, in which case check the wiring from
the alternator “B” terminal to fusible link to
battery (+) terminal. Check for loose connec-
tion, color change due to overheated harness,
etc. and correct them before testing again.
(3) Upon completion of the test, set the engine
speed at idle. Turn off the lights and turn off
the ignition switch.
(4) Disconnect the battery ground cable.
(5) Disconnect the ammeter and voltmeter that
have been connected for the test purpose.
(6) Connect the alternator output wire to the alter-
nator “B” terminal.
(7) Connect the battery ground cable.
TPP m^..:s:....
OUTPUT CURRENT TEST
This test judges whether or not the alternator
gives an output current that is equivalent to the
nominal output.
Preparation
(1) Prior to the test, check the following items and
correct as necessary.
(a) Check the battery installed in the vehicle to
ensure that it is in sound state*. The
battery checking method is described in
“BATTERY”.
NOTE
* The battery that is used to test the
output current should be one that has been
rather discharged. With a fully charged bat-
tery, the test may not be conducted cor-
rectly due-to an insufficient load.
(b) Check tension of the alternator drive belt.
The belt tension check method is de-
scribed in “GROUP 7 - Service Adjust-
ment Procedures”.
(2) Turn off the ignition switch.
(3) Disconnect the battery ground cable.
(4) Disconnect the alternator output wire from the
alternator “B” terminal.
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