The starter motor can be used for a load test.
STEP 2 of 3
STEP 2 performs a basic load-test of the battery, using the vehicle’s starter
motor. This test is done with the engine cranking. Use care to keep the
voltmeter test leads from contacting moving or hot engine parts.
Tool required: Digital Voltmeter, set on DC Volts
Test Lead position: as shown in diagram above
While cranking, read the voltmeter. If the voltage reading is below the minimum
listed in the following chart, replace the battery.
Be aware that other possible causes of low readings in this test are a failing
starter motor or an engine with mechanical problems.
Minimum Battery Load-test Voltage
Battery Temp Degrees F
9.90
100
9.80
90
9.70
80
9.60
70
9.50
60
9.40
50
9.30
40
9.10
30
8.90
20
8.70
10
8.50
0
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