4 SECTION 55 - ELECTRICAL SYSTEM
1.2 FAULT FINDING
PROBLEM CAUSE CORRECTION
Electrical system is inoperative Loose or corroded battery
connections
Clean and tighten connections
Sulphated batteries
Battery Isolator switch turned OFF
Main machine fuse link blown
Check that the battery voltage with
open circuit is at least 12.6 V.
Check the electrolyte level and
density.
Restore the battery isolator switch.
Find the reason of the failure and
replace the connection fuse.
Starter motor speed too low, the
engine cranks slowly
Loose or corroded connections
Low battery output voltage
Incorrect viscosity of the engine oil
Clean and tighten loose connections.
Check that the battery voltage with
open circuit is at least 12.6 V.
Check the electrolyte level and
density.
Use an oil with correct viscosity for
the temperature conditions.
Starter motor inoperative Transmission shift lever in gear
Loose or corroded connections
Dead batteries
Move gearshift lever to neutral.
Clean and tighten loose connections.
Charge or replace the batteries.
Charge indicator lamp stays on
with engine running
Low engine idle speed
Loose belt
Malfunctioning battery
Malfunctioning alternator
Increase idle speed.
Check belt tension.
Check that the battery voltage with
open circuit is at least 12.6 V.
Check the electrolyte level and
density.
Check alternator.
Batteries will not charge Loose or corroded terminal
connections
Sulphated batteries
Loose or worn belt
Clean and tighten the connections.
Check that the battery voltage with
open circuit is at least 12.6 V.
Check the electrolyte level and
density.
Check the automatic belt tensioner.
Replace belt if required.
Charge indicator flashing
indicating excessive charging
voltage
Malfunctioning alternator Check alternator.
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