Section C - Electrics
Service Procedures
Alternator
C - 12 C - 12
9803-9450-1
7 Start the engine and run at maximum speed (see
Technical Data). Meter should show maximum
alternator output in Amps (see Technical Data).
Note: The meter reading should be taken as soon as
possible after starting the engine, as the charging current
will fall rapidly.
8 A zero reading indicates failure of the alternator and
may be caused by one of the following conditions.
These are listed in the order of probability.
a Defective suppression capacitor.
b Dirty slip rings or worn brushes.
c Defective regulator.
d Defective rectifier.
e Open or short - circuited field (rotor) windings.
f Open or short - circuited power (stator) windings.
9 To check for fault a, disconnect the capacitor and
repeat the charging test. Renew the capacitor if
necessary.
10 To check for faults b and c, remove the regulator and
brush box assembly. Check the condition of the
brushes and, if necessary, clean the slip rings using
extra-fine glass paper. The regulator may only be
checked by substitution.
11 Faults d, e, and f may be checked only by removing
and dismantling the alternator for further testing.
AVO 2002 – Red lead to volts (middle) socket on
meter.
– Black lead to negative on meter.
– RH slider to DC voltage.
– LH slider. K
Fig 10. ( T C-11).
AVO 2003 – Red lead to amps socket (marked A) on
the meter.
– Black lead to negative on meter.
– RH slider to DC voltage
– LH slider to 200 Shunt
FLUKE 85 – Red lead to volts socket (marked V ) on
meter.
– Black lead to COM socket on meter.
– Set dial to mV.
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