Hatz 2-4L30 Workshop Manual page 172

Trouble-shooting table for electrical system
Trouble-shooting at the alternator
Malfunction
When engine is stop-
ped the generator
telltale light burns
brightly, but when
engine is running.
Generator telltale
light does not burn
when engine is stop-
ped and pre-
heat/start switch is
turned on.
Generator telltale
light flickers.
4
L / M . . / 07.96
Cause
Poor connections, contact resistance
in charge circuit or in the line to the
generator telltale light.
Defective voltage regulator.
Defective alternator.
Generator telltale light bulb has
blown or contacts are corroded.
Battery is flat.
Battery is defective (internal short-
circuit or sulphate deposits).
Defective pre-heat/start switch, poor
contacts.
Defective wiring line resistance in
charging circuit or line to generator
telltale light.
Defective voltage regulator.
Short-circuit in an alternator exciter
or positive diode.
Carbon brushes worn.
Corrosion deposites on sliprings,
open circuit in exciter winding.
KV-belt at alternator is too slack.
Remedy
Eliminate contact resistance, clean
terminals, tighten loose terminals.
Renew voltage regulator
Have alternator repaired.
install a new bulb. Clean the con-
tacts.
Recharge with a suitable charger.
Renew the battery.
Eliminate contact resistance, renew
wiring, tighten loose terminals if
necessry renew pre-heat/ start
switch.
Renew the voltage regulator.
Disconnect charging line B+ (to pre-
vent discharge at a standstill), repair
alternator .
Renew carbon brushes.
Have alternator repaired.
Tension V-belt correctly.