Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 609

ENGINE ELECTRICAL 6D – 43

2. OVERCHARGING

Checkpoint

Trouble

Cause

Countermeasure

B and F terminal circuit

Shorted

Repair

IC regulator

Excessive voltage

Replace

OK

OK

NG

NG

6D – 44 ENGINE ELECTRICAL

3. UNDERCHARGING

Checkpoint

Trouble

Cause

Countermeasure

Battery terminals

Loosely connected

Retighten

Drive belt

Slippage

Adjust or replace

Brush and slip ring contact

Intermittent

Replace or repair the brush

holder assembly

Short circuit

Repair or replace

Short or open circuit

Repair or replace

Defective

Replace

Insufficient voltage

Replace

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Generator rotor coil

Generator diode

Excessive

Use a higher capacity alternator

or reduce the accessory load

NG

IC regulator

Electrical load

Generator stator coil

OK

OK

OK

OK

ENGINE ELECTRICAL 6D – 45

4. UNSTABLE CHARGING CURRENT

Checkpoint

Trouble

Cause

Countermeasure

Terminals and connectors

Broken or defective

Repair the push rod play

Drive belt

Loose

Tighten (Readjust)

Brush with slip ring

Poor contact

Repair or replace

Generator rotor coil

Open or short circuit

Repair or replace

Generator stator coil

Open or short circuit

Repair or replace

Stator coil and diode

connections

Loose

Repair

IC regulator

Defective

Replace

OK

OK

OK

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

6D – 46 ENGINE ELECTRICAL

5. NOISE

Checkpoint

Trouble

Cause

Countermeasure

Part mounting fasteners

Loose

Tighten

Drive belt

Defective

Replace

Bearing

Defective

Replace

Diode

Defective

Replace

Stator coil

Short circuited

Repair or replace

OK

OK

OK

OK

OK

NG

NG

NG

NG

NG