Case 580SR Service Manual page 980

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CHECKING THE MAXIMUM OUTPUT OF THE
ALTERNATOR
Z Check that the ignition is turned off (key on "off").
Z Disconnect the negative cable from the battery and
disconnect cable B+ (5) from the alternator.
Z Connect an ammeter (2) between terminal B+ (1)
of the alternator and the disconnected cable B+
(negative side towards the cable).
Z Connect a voltmeter (4) between terminal B+ of the
alternator and the ground.
Z Reconnect the battery, start the motor and in-
crease its speed to 2000 rpm.
Z Gradually reduce the resistance (3) until the am-
meter shows 90 A.
Z Observe the voltmeter, which must not indicate a
value that is less than 14.2 V.
If the value lowers below 14.2 V, an alternator com-
ponent is defective.
Carry out the operations described in the "Checking
the alternator components".
SECTION 55 - ELECTRICAL SYSTEM
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