1987 MITSUBISHI MONTERO Fusible link

8-76 CHARGING SYSTEM - Circuit Diagram
3 CHARGING CIRCUIT
Battery Ignition switch
OFF
Main
m fusible ’ L
link
A-02
fl.3-Br 1~5~~
, A-23 Sub fusible link
(IGN . SW)
IAM IG ] c-55
3
3
A m
A
To turn signal flasher
unit [Refer to P.8-49.1 Multi-
n, Irnn4P
ComSeter
Remark
For information concerning the ground points (example:
q ),
refer to P.8-7. 37W605
Wiring color code
B: Black Br: Brown G: Green Gr: Gray L: Blue Lg: Light green
LI: Light blue 0: Orange P: Pink R: Red Y: Yellow W: White
1 STB Revision

CHARGING SYSTEM - Service Adjustment Procedures 8-77
SERVICE ADJUSTMENT PROCEDUREswmAB
lEL15I
INSPECTION OF THE CHARGING SYSTEM
VOLTAGE DROP TEST OF ALTERNATOR OUTPUT WIRE
This test judges whether or not the wiring (including the fusible
link) between the alternator B terminal and the battery (+) terminal
is sound by the voltage drop method.
Preparation
(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 ammeter to the “B” terminal and the (-) lead to
the disconnected output wire.
NOTE
Use of a clamp type ammeter that can measure current with-
out 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 con-
nection 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.
(5) Connect a digital voltmeter between the alternator “B” termi-
nal and battery (+) terminal. Connect the (+) lead wire of the
voltmeter to the “B” terminal and the (-) lead wire to the
battery (+) terminal.
(6) Connect the battery ground cable.
(7) Leave the hood open.
Test
(1) Start the engine.
(2) Turn on or off the headlights and small lights and adjust the
engine speed so that the ammeter reads 20 A and read off the
voltmeter indication under this condition.
Result
(1) It is okay if the voltmeter indicates the standard value. ’
Standard value : 0.2 V max.
(2) If the voltmeter indicates a value that is larger than the stan-
dard value, poor wiring is suspected, in which case check the
wiring from the alternator “B” terminal to fusible link to bat-
tery (+) terminal. Check for loose connection, color change
due to overheated harness, etc. and correct them before test-
ing 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 con-
nected for the test purpose.
(6) Connect the alternator output wire to the alternator “B” ter-
minal.
(7) Connect the battery ground cable.
( STB Revision

8-78 CHARGING SYSTEM - Service Adiustment Procedures
80A
n
Relay with diode
Voltmeter
Ammeter Iad
176
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 de-
scribed 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 battery, the test may not be conducted correctly
due to an insufficient load.
(b) Check tension of the alternator drive belt. The belt tension
check method is described in “GROUP 7 COOLING -
Service Adjustment Procedures”.
(2) Turn off the ignition switch.
(3) Disconnect the battery ground cable.
(4) Disconnect the alternator output wire from the alternator “B”
terminal.
(5) Connect a DC ammeter (0 to 100 A) in series between the “B”
terminal and the disconnected output wire. Connect the (+)
lead of the ammeter to the “B” terminal and connect the (-)
lead wire to the disconnected output wire.
NOTE
Tighten each connection by bolt and nut securely as a heavy
current will flow. Do not relay on clips.
(6) Connect a voltmeter (0 to 20 V) between the “B” terminal and
ground. Connect the (+) lead wire to the alternator “B” ter-
minal and (-) lead wire to a sound ground.
(7) Set the engine tachometer and connect the battery ground
cable.
(8) Leave the engine hood open.
Test
(1) Check to see that the voltmeter reads the same value as the
battery voltage.
If the voltmeter reads 0 V, an open circuit in the wire between
the alternator “B” terminal and battery (-) terminal, a blown
fusible link or poor grounding is suspected.
(2) Turn on the headlight switch and start the engine.
(3) Set the headlight at high beam and the heater blower switch
at HIGH, quickly increase the engine speed to 2500 rpm and
read the maximum output current value indicated by the am-
meter.
NOTE
After the engine start up, the charging current quickly drops.
therefore, above operation must be done quickly to read max-
imum current value correctly.
[ STB Revision
--I

8-80 CHARGING SYSTEM - Service Adjustment Procedures
Ignition
switch Alternator
Voltmeter
I
lid-hi! @ Ammeter e Load
6EK52
(5) Disconnect the alternator output wire from the alternator “B”
terminal.
(6) Connect a DC ammeter (0 to 100 A) in series between the “B”
terminal and the disconnected output wire. Connect the (+I
lead of the ammeter to the “B” terminal and connect the (-1
lead wire to the disconnected output wire.
(7) Set the engine tachometer and connect the battery ground
cable.
Test
(1) Turn on the ignition switch and-check that the voltmeter indi-
cates the following value.
Voltage : Battery voltage
If it reads 0 V, 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 lights and accessories off.
(3) Run the engine at a speed of about 2500 rpm and read the
voltmeter when the alternator output current drops to 10 A or
less.
Result
(1) If the voltmeter reading agrees with the value listed in the
regulating voltage table below, the voltage regulator is func-
tioning correctly. If the reading is other than the standard
value, the voltage regulator or the alternator is faulty.
Regulating voltage table
Voltage regulator ambient Regulating voltage V
temperature “C (“F)
-20 (-4) 14.2-15.4
20 (68) 13.9-14.9
60 (140) 13.4-14.6
80 (176) 13.1-14.5
1 STB Revision

8-94 STARTING SYSTEM -Troubleshooting
TROUBLESHOOTING NOFH-
Symptom
Engine will not crank
Engine cranks slowly
Starter keeps running
Starter spins but en-
Jine will not crank Probable cause Remedy Reference
paw
Battery charge low Check battery specific gravity 8-81
,
I Charge or replace battery 8-82
Battery cables loose, corroded or worn Repair or replace cables 8-81
__~
Inhibitor Switch faulty Adjust or replace switch Refer to
(Vehicle with automatic transmission only) GROUP 21.
Fusible link blown
Replace fusible link 8-69
Starter motor faulty
Repair starter motor 8-97
Ignition switch faulty Replace ignition switch 8-l 22
Battery charge low Check battery specific gravity 8-8 1
Charge or replace battery 8-82
Battery cables loose, corroded or worn
Repair or replace cables 8-8 1
Starter motor faulty Repair starter motor 8-97
Starter motor faulty Repair starter motor 8-97
Ignition switch faulty
Replace ignition switch 8-l 22
I
Short in wiring
Repair wiring -
Pinion gear teeth broken or starter motor Repair starter motor 8-97
faulty
Ring gear teeth broken Replace flywheel ring gear or Refer to
torque converter GROUP 9.
1 STB Revision
-7

STARTING SYSTEM - Circuit Diagram 8-95
1 STARTING CIRCUIT
(VEHICLES WITH A MANUAL TRANSMISSION)
11171 w
$in fusible
START
I k


9
OFF
ON ACC
ST
c-55
.I
m I BY
Sub fusible link Ignition switch
Starter
37W626 / STB Revision

8-96 STARTING SYSTEM - Circuit Diagram
(VEHICLES WITH AN AUTOMATIC TRANSMISSION)
I
Sub fusible link
A-23 (IGN . SW)
_ 5-WI-754 1
0.5-G 1, 1,
L-l m 1 L-W
Battery Ignition switch
c-47
2-BY-Z-BY*2
N P
!-BY Z-BY1 (Z-BY*]
L-l
R BY BY
“I “2
Remark
For information concerning the ground points (example:
q ),
refer to P.8-7.
Wiring color code
B: Black
Br: Brown
G: Green
Gr: Gray L: Blue
LI: Light blue
0: Orange P: Pink Lg: Light green
R: Red
Y: Yellow
W: White
STB Revision

8-110 IGNITION SYSTEM - Circuit Diagram
2 IGNITDN CIRCUIT
Sub fusible link
A-23
(IGN - SW) Ignition switch
5-wn5-w-
0.5-G 1
u
63- Z-W
I
IAT
Main 1
fusible
Rnttprv link
m
ze 3 cj _-’ A:“p m
N CL
I 64-b I I I m
I
Ei
I
L Disi
To combination meter d A-an b
(TACHO)
[Refer to P.8-52.1
I I Ignition coil
37 w009
Remaik
-‘For information concerning the ground points (example: q ),
refer to P.8-7.
Wiring color code’ c
B: Black Br: Brown G: Green Gr: Gray L: Blue Lg: Light green
LI: Light blue 0: Orange P: Pink R: Red Y: Yellow V/: White
1 STB Revision 1