Case 580SR Service Manual page 978

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CHECKING THE CHARGING CURRENT AND
THE REGULATED VOLTAGE
Z Make sure that all electrical components are pow-
ered off and that the ignition is turned off (key on
"off").
Z Disconnect the negative terminal from the battery
and disconnect terminal B+ (4) from the alternator.
Z Connect an ammeter (1) between the disconnect-
ed cable (3) and terminal B+ of the alternator.
Z Connect a voltmeter (2) between terminal B+ of the
alternator and the ground.
Z Reconnect the battery. Start the motor and run it at
a speed of 2000 rpm. Observe the values shown
on the ammeter and the voltmeter.
The voltage shown on the voltmeter should at first be
too high and then should stabilize between 14.2-
14.8 V when the value on the ammeter lowers below
10 A.
If the voltmeter stabilizes at a voltage greater than
14.8 V, the regulator of the alternator needs to be re-
placed.
On the other hand, if the voltmeter stabilizes below
14.2 V, a component of the alternator is defective or
the resistance in the external connections of the
charging circuit is too high.
If the ammeter indicates zero amps, an alternator
component is defective.
Turn off the motor and carry out the operations de-
scribed in the "Checking the alternator components".
SECTION 55 - ELECTRICAL SYSTEM
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