Isuzu engine C22NE / 22LE / 20LE. Manual - part 39

STARTING AND CHARGING SYSTEM  6D3-7

Charging System

General Description

The charging system is an IC integral regulator charging
system and its main components are connected as shown in
illustration.
The regulator is a solid state type and it is mounted along with
the brush holder assembly inside the generator installed on the
rear end cover.
The generator does not require particular maintenance such as
voltage adjustment. The rectifier connected to the stator coil
has eight diodes to transform AC voltage into DC voltage.
This DC voltage is connected to the output terminal of
generator.

Legend

1 Startor assembly
2 Housing
3 Slipring
4 Screws (2)
5 Regulator
6.Bolt (4)

7 Rectifier assembly
8 Retaining assembly
9 B+ terminal nut and washer

10 Pulley
11 Rotor assembly
12 Ball bearing

2

11

12

2

8

5

4

3

1

11

7

6

10

9

6D3-8  STARTING AND CHARGING SYSTEM

General On-Vehicle Inspection

The operating condition of charging system is indicated by the
charge warning lamp. The warning lamp comes on when the
starter switch is turned to "ON" position. The charging system
operates normally if the lamp goes off when the engine starts.
If the warning lamp shows abnormality or if undercharged or
overcharged battery condition is suspected, perform diagnosis
by checking the charging system as follows:
1. Check visually the belt and wiring connector.

2. With the engine stopped, turn the stator switch to "ON"

position and observe the warning lamp.

If lamp does not come on:

Disconnect wiring connector from generator, and ground

the terminal "L" on connector side.

If lamp comes on:

Repair or replace the generator.

Generator

Removal

1. Disconnect battery ground cable.

2. Move drive belt tensioner to loose side using wrench then

remove drive belt.

3. Disconnect terminal "B" wiring connector and connector.

4. Remove generator assembly.

Generator Power and Circuit Diagram

Inspection

Legend

1 Load resistor, set parallel to battery
2 Battery
3 Voltmeter
4 Ammeter
5 Ignition Lock
6 Charge Telltale
7 Generator

1. Disconnect battery.

2. Close off connecting cable from alternator terminal "B+".

3. Set ammeter (measuring range 100A) in disconnected line.

4. Connect controllable load resistor to battery terminal.

5. Set resistor in front of connection to "O"; connect first to

battery, then to resistor.

6. Connect tachometer.

7. Connect oscilloscope according to manufacturer's

instructions.

8. Connect battery.

9. Start engine and read off resulting current at various engine

speeds.

STARTING AND CHARGING SYSTEM  6D3-9

Generator Power

1. Adjust load resistor, if the required load currents are not

attained.

2. The shape of the voltage curves on oscilloscope curve

should be regular.

3. Test value: 5 to 7A.

4. If the required minimum current intensity is not attained, or if

the oscilloscope picture shows variations, the alternator

should be overhauled.

Regulated Voltage Circuit Diagram

Legend

1 Battery
2 Ignition Lock
3 Charge Telltale
4 Resistor, for attainment of load current with the battery set in

series

5 Voltmeter
6 Ammeter
7 Generator

Installation

1. Install generator assembly and bring generator assembly to

the position to be installed.

2. Install generator assembly and tighten to the specified

torque.

Torque:

Long bolt: 35 N.m (3.6 kgf.m)

Short bolt: 20 N.m (2.0 kgf.m)

3. Connect wiring harness connector.

4. Move drive belt tensioner to loose side using wrench, then

install drive belt to normal position.

5. Reconnect battery ground cable.

6D3-10  STARTING AND CHARGING SYSTEM

The generator has four external connections; the "B+" lead to
battery positive, "L" lead to the warning lamp circuit(max. 2
watts), "S" lead to battery positive terminal for battery sensing
and an earth connection.

Explanation of type inscripiton

Example:KC-A--> 14V 50-90A.

K

= Code for Stator OD(126mm OD).

C

= Compact Generator.

A

= Ausland (countries other than Germany)

>

= Direction of rotation(clockwise).

14V = Generator Operating Voltage.
50A = Stabilised output at 25 C at 1800 RPM./13.5

Volts.

90A = Stabilised output at 25 C at 1800 RPM./13.5

Volts.

Generator Connetions.

B+ : Battery Main Connection (battery positive)
S

: Battery Sense Connection(battery positive)

L

: Waring lamp(via warning lamp to Ignition switch)

BATT.SENSE

REGULATOR ASSEMBLY

HYBR10

ALTERNATOR ASSEMBLY

12V BATT.

1GN.SW.

300a*

WARN.LAMP

1.2 WATT

L

S

8+

SUPPRESSOR
CAPACITOR
0.5

µ

f

NOTE: * RESISTOR IS RECOMMENDED TO

ENSURE THAT THE GENERATOR
REMAINS FUNCTIONAL IN CASE OF
WARNING LAMP FAILURE