Battery Capacity Test

1. To carry out this test, use a high rate discharge tester; Stater, Alternator, Battery Regulator, Electrical tester (SABRE) in conjunction with the 73 Digital Multimeter.
2. Turn the SABRE OFF.
3. Turn the 73 Digital Multimeter selector switch to the DC volt position.

NOTE: The 73 Digital Multimeter clips must contact the battery terminal and not the tester clips. Unless this is done, the actual battery terminal voltage will not be indicated.

4. Connect the SABRE and the 73 Digital Multimeter positive test leads to the battery positive terminal and both negative test leads to the ground battery terminal.
5. Turn the load control knob in a clockwise direction until the ammeter reading reads approximately half the cold cranking amps of battery.
6. With the ammeter reading the required load for 15 seconds, note the multimeter reading. Avoid leaving the high discharge load on the battery for periods longer than 15 seconds.
7. If the 73 Digital Multimeter reading is 9.6 volts at 21°C (70°F)or more, the battery has a good output capacity and will readily accept a charge, if required.
8. If the voltage reading obtained during the capacity test is below 9.6 volts at 21°C (70°F), and the battery is fully charged, the battery is damaged and a new one must be installed. If unsure about the state of charge, charge the battery.
9. After the battery has been charged, repeat the capacity test. If the capacity test battery voltage is still less than 9.6 volts at 21°C (70°F), install a new battery. If the voltage is 9.6 or more at 21°C (70°F), the battery is OK.
10. If the battery is found to be discharged only, check for a loose accessory drive belt, loose electrical connection, charging system operation, and carry out the battery drain test.