Actron AutoAnalyzer CP7665 - Manual (Page 15)

15
Starting/Charging System Testing
The starting system “turns over” the engine. It consists of the battery, starter
motor, starter solenoid and/or relay, and associated wiring and connections.
The charging system keeps the battery charged when the engine is running.
This system consists of the alternator, voltage regulator, battery, and
associated wiring and connections. The digital multimeter is a useful tool for
checking the operation of these systems.
No Load Battery Test
Before you do any starting/charging
system checks, you must first test
the battery to make sure it is fully
charged.
Test Procedure (see Fig. 17):
Fig. 17
Black
Red
1. Turn Ignition Key OFF.
2. Turn ON headlights for 10 sec-
onds to dissipate battery sur-
face charge.
3. Insert BLACK test lead into
COM test lead jack.
4. Insert RED test lead into
test lead jack.
5. Disconnect positive (+) battery
cable.
6. Connect RED test lead to posi-
tive (+) terminal of battery.
7. Connect BLACK test lead to
negative (-) terminal of battery.
8. Turn multimeter rotary switch
to 20V DC range.
9. View reading on display.
10. Test Results.
Compare display reading in Step
9 with the following chart.
Percent
Voltage Battery is Charged
12.60V
or greater
100%
12.45V 75%
12.30V 50%
12.15V 25%
If battery is not 100% charged, then
charge it before doing anymore start-
ing/charging system tests.