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LOAD TEST THE BATTERY
Note: The battery must have at least 75% state of charge before load testing and the battery should not have been
heavily used or tested within the last 10 minutes. On vehicles with multiple batteries, only one battery at a time should be
tested.
1. Make sure load knob is in the OFF position before connecting.
2. Set Voltage selector to the appropriate voltage.
3. Connect Tester leads to battery (+) and (–) terminals.
4. Apply a load to the battery as determined in "CALCULATING THE LOAD."
5. Hold load for 15 seconds.
6. Read voltage at the end of the 15 seconds (alarm will sound) and turn off load.
7. Compare reading with PASS/FAIL voltage chart on side of tester, or use chart shown below to compensate for battery
temperature.
Battery Temperature
70℉ (21℃)
60℉ (16℃)
50℉ (10℃)
40℉ (5℃)
30℉ (-1℃)
20℉ (-7℃)
8. Battery is GOOD if voltage is at or above Volt readings shown on chart. Battery is BAD if voltage drops below Volt read-
ings shown on chart.
ONCE READING IS CONFIRMED, THE LOAD MUST BE TURNED OFF IMMEDIATELY TO PREVENT OVERHEATING
– COMPLETELY TURN LOAD CONTROL COUNTERCLOCKWISE.
CHARGING SYSTEM (ALTERNATOR/REGULATOR) TEST
This test assesses charging system output to ensure it is within the proper range, a key factor for long battery battery life.
Note: Do not turn on the load switch at any point during this test.
1. Make sure load knob is in the OFF position before connecting.
2. Set Voltage selector to the appropriate voltage.
3. Connect Tester leads to battery (+) and (–) terminals.
4. Start the engine and allow it to reach normal operating temperature.
5. Run engine at 1200 to 1500RPM.
CAUTION: Stay clear of moving engine parts.
6. Read the voltmeter. A reading in the red band area indicates a problem in the charging system that will undercharge a
battery; if the reading is beyond the OK area, the charging system is likely to overcharge the battery.
Note: If you observe an out of range reading, check alternator connections, including ground connection. Also, check
manufacturer specifications, as output requirement may vary by vehicle type and manufacturer (confirm range is, in fact,
out of range for the specific vehicle being tested).
STARTER MOTOR TEST (12 VOLT VEHICLES)
This test identifies excessive starter current draw, which makes starting difficult and shortens battery life.
Note: ENGINE MUST BE AT NORMAL OPERATING TEMPERATURE FOR THIS TEST
1. Make sure load knob is in the OFF position before connecting.
2. Set Voltage selector to the appropriate voltage.
3. Connect Tester leads to battery (+) and (–) terminals. Rock clamps back and forth while connecting to ensure a good
electrical connection.
4. Disable the ignition system so the car will not start.
5. Crank the engine and observe the lowest voltage reading during cranking.
6. A meter reading of below 9.5V (12V system) indicates excessive current draw. This may be due to a failing battery, bad
battery/starter connections or a failing starter motor. Or, the battery is too small for the vehicle's requirements.
12 Volt Battery
Voltage Should Not Drop Below
9.6 Volts
9.5 Volts
9.4 Volts
9.3 Volts
9.1 Volts
8.9 Volts
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