Technical data

Because of the use of IC's (integrated circuits), the electronic voltage-regulator is very
compact and is built in the rear bracket of the alternator.
Charging Voltage Test
1. Turn key
switch off
on marine
engines or
disconnect
the oil
pressure
switch wire
on
generator
sets.
2. Disconnect
cable from
positive (+)
terminal of
battery and connect an ammeter in series between the cable and positive (+) terminal of
the battery.
3. Connect a voltmeter between terminal (L) of alternator and ground. Check to ensure that
the voltmeter reading is zero. If the pointer of the voltmeter deflects (a voltage present),
a defective alternator or wiring is suspected.
4. Turn key switch on or connect the oil pressure switch terminal to ground, but do not start
the engine. The voltmeter reading should be considerably lower than the battery voltage.
If the voltmeter reading is much the same as the battery voltage, a defective alternator is
suspected.
5. With the ammeter terminals short-circuited, start the engine.
CAUTION:
MAKE SURE THAT WHEN THE ENGINE IS STARTED, NO STARTING CURRENT IS
APPLIED TO THE AMMETER.
6. Remove the short circuit across the ammeter terminals and increase the engine speed
immediately to approximately 2,000 to 3,000 rpm. Take the ammeter reading.
7. If the ammeter reading is 5A or less, take the voltmeter reading without changing the
engine speed (2,000 to 3,000 rpm). The reading is the charging voltage.
NOTE: Since the electronic voltage regulator is a temperature compensation type, the
charging voltage varies with temperature. Therefore, the temperature around the rear bracket
of the alternator must be measured and the charging voltage corrected to the temperature.