Associated Equipment 12-1012 Manual - Manual (Page 39)

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Model 12-1012 Users’ Manual Version 13.08
Associated Equipment Corp.
5043 Farlin Ave. 800-949-1472(US)
St. Louis, MO 63115 314-385-5178 (Outside US)
If the voltage goes above 15.0 volts, the voltage regulator shuts off the
current to the field terminal and keeps the battery from overcharging and
cooking itself. This is how the voltage regulator controls the alternator
output.
When you first start your vehicle, the alternator needs some current to start
working. The voltage regulator supplies this current from the battery to the
field (stator) terminal of the alternator to get it started.
The state of charge of the battery controls amperage output of the
alternator. When the battery has a full charge, the electro-motive force of
the voltage lowers the amperage to almost zero. As the battery charge
wears down, the electro-motive force is not enough to stop the amperage,
so it flows into the battery and charges it again.
10.1 – Start Testing
This test is to check the MAX and MIN charging voltages output of the
alternator at 3000 RPM without load and 2000 RPM with all loads ON. With
this test you can determine the alternator’s condition when in reference with
the vehicle’s Service Manual.
No load testing at 3,000 RPM
1. With engine OFF, place the vehicle transmission in NEUTRAL for
Manual and PARK for Automatic and apply the parking brake.
2. Attach the Analyzer clips onto the battery terminal posts and it will
power up and lights up the LCD display screen as shown (Fig.48)
Figure 48