For 1990-2009 cars

1. Use a DMM to check the voltage across the battery terminals. If the green dot is visible, the voltage should be 12 volts or above. If not, replace the battery. Refer to Battery Replacement .
2. Install battery terminal adapters.
3. Connect a voltmeter and a battery lead tester across the battery terminals.
4. Apply a 300 ampere load for 15 seconds in order to remove the surface charge from the battery. Remove the load.
5. Wait 15 seconds in order to let the battery recover, then apply the specified load from the specifications. Read the voltage after 15 seconds, then turn off the load.

Important: The battery temperature must be estimated by the feel and by the temperature the battery has been exposed to for the preceding few hours.

6. When the voltage does not drop below the minimum voltage, the battery is good and should be returned to service. If the voltage is less than the minimum, replace the battery. Refer to Battery Temperature Versus Voltage Drop .