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A 05.00 Start electrical
General instructions on the engine's
electrical system:
– Never interchange the positive and neg-
ative terminals at the battery.
– Do not disconnect the battery when the
engine is running.
– Avoid all risk of short-circuiting live
cables (for instance, never test whether
a cable is live by touching it to earth).
– If the charge telltale light bulb blows,
replace it immediately.
– If any welding is done on the engine or
the equipment to which it is fitted,
attach the earth (ground) clip of the
welding set as close to the weld area as
possible, and disconnect the alternator
from the electrical circuit at connections
„B +" and „D -".
– When cleaning the engine, avoid
spraying water on the alternator or any
other components of the electrical
system.
If this is unavoidable, first disconnect
the battery; before it is reconnected, dry
all components thoroughly with a
compressed air jet.
– If a malfunction, for instance low battery
charge, charge telltale light on etc,
should be detected, always check the
tightness of cable connections and
correct V-belt tension before making any
other operational checks.
– For trouble-shooting in the event of a
fault, see section 4.
– When recharging the battery,
disconnect the negative terminal.
– Avoid using electrical starting aids
because of the risk of voltage peaks
(these could damage electronic
components).
2
L / M . . 09.96
Checking operation of the alternator
with voltage regulator (checking
charging current):
– With the engine stopped and the
starting-switch key at „0", detach the
B + line (leading to the battery) from the
alternator and connect a DC ammeter
with a scale reading of 0 .. 50 A
between alternator terminal B + and the
detached cable. Make sure that the
loose cable cannot touch any metal
parts of the engine.
– Connect a DC voltmeter with a scale of
0 . . 30 V to the battery's positive and
negative poles.
– Start the engine and note the meter
readings. Check the voltmeter display.
With the alternator in good working
order and electrical consumers in
circuit, the ammeter should indicate a
charging current. Its value depends on
the battery's state of charge (if the
battery is flat, the charging current is
high, if the battery is fully charged, the
charging current is low), but also on the
consumpition of electrical equipment
actually in use and on alternator and
therefore engine running speed. If there
are no consumers in circuit, a charging
current should even be indicated at idle
speed. If the alternator voltage is too
high, renew the voltage regulator.
Test values
Voltmeter reading
Charging current at
13.5 V or 27 V
Battery voltage-
– Engine speed
800 rpm (idle)
– Engine speed
1500 rpm
System
12 V
24 V
13.0 -
14.5 V
26 - 29 V
approx.
approx.
25 A
5 A
40-45 A
25-30 A
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Troubleshooting
