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L / M . . / 07.96
Trouble-shooting table for electrical system
Trouble-shooting at instrument box
Malfunction
Starter remains engaged
although pre-heat/starter
switch was released.
Alternator telltale light does
not come on when engine is
stopped and pre-heat/starter
switch is on.
Generator telltale light
flickers.
Generator telltale light
continues to glow, after
starting engine.
Cause
Pre-heat/starter switch sticks in
position 3 after starting and
does not return automatically to
position I.
Bulb has blown or contacts are
corroded.
Battery is flat.
Battery is defective (internal
short-circuits or sulphatised).
Defective pre-heat/starter
switch, poor connections,
defective wiring, contact
resistance in charging current
circuit or line to generator telltale
light.
Defective voltage regulator.
Short-circuit at exciter or
positive diode in generator.
Worn carbon brushes.
Oxide desposit on sliprings,
exciter winding is interrupted
V-belt loose at generator.
Poor earth (ground) connection
in instrument box.
Wiring error, e.g. generator tell-
tale light leads to oil pressure
switch.
Remedy
Set pre-heat/starter immediately
to 0 by force; if this is not possi-
ble, disconnect the battery at
once. (If the starter remains
engaged for more than 2 to 3
minutes, it will burn out.)
Renew the pre-heat/starter
switch.
Insert a new bulb, clean the
contacts.
Reacharge the battery.
Renew the battery.
Eliminate contact resistance,
renew wiring, tighten loose
terminals, if necessary renew
pre-heat/starter switch.
Renew voltage regulator.
Disconnect charge line B+ (to
prevent discharge at a standstill),
have generator repaired.
Renew carbon brushes.
Have generator repaired.
Correct V-belt tension.
Make a clean earth connection in
the instrument box.
Check the line from the generator
telltale light to the generator and
correct the wiring if necessary.
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