250V MAX
15A MAX
FUSED
COM
DC
15A
AUTO POWER OFF
CP7678
®
OFF
200
20
2
DC V
200
m
20M
200
K
20K
2K
200
8CYL
6CYL
TACH
X10
5CYL
4CYL
8CYL
6CYL
5CYL
4CYL
DWELL
DUTY
CYCLE
%
OHMS
°
15
A
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.
Fig. 18
BlackRed
Test Procedure (see Fig. 18):
1. Turn Ignition Key OFF.
2. Turn ON headlights for 10 seconds to
dissipate battery surface 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 positive (+)
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
chart below.
Voltage Percent 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 starting/charging sys-
tem tests.
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