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BATTERY OPEN CIRCUIT VOLTAGE TEST An open circuit voltage no load test shows the state of charge of a battery and whether it is ready (1) Remove both battery cables, negative cable first. Connect a Volt/Ammeter/Load tester (Fig. 8) to (2) Allow the battery to stabilize for 2 minutes, and then verify the open circuit voltage. Refer to Bat- (3) This voltage reading will approximate the state of charge of the battery. It will not reveal battery IGNITION OFF DRAW TESTS (IOD) High battery current draw when the ignition switch in the off position will discharge a battery. (1) Verify all electrical accessories are OFF: • Turn off all lamps • Trunk compartment lamp is disconnected or removed • Glove box lamp goes off when the door is closed • All doors are closed • Sun visor vanity lamps are OFF CAUTION: Do not operate any accessory that has a BATTERY LOAD TEMPERATURE TABLE Minimum Voltage Temperature °F °C 9.6 volts 70° and above 21° and above 9.5 volts 60° 16° 9.4 volts 50° 10° 9.3 volts 40° 4° 9.1 volts 30° -1° 8.9 volts 20° -7° 8.7 volts 10° -12° 8.5 volts 0° -18° Fig. 8 Testing Open Circuit Voltage Fig. 9 Volt-Ammeter Load Tester Connections 1 – BATTERY NEGATIVE CABLE BATTERY OPEN CIRCUIT VOLTAGE Open Circuit Volts Charge Percentage 11.7 volts or less 0% 12.0 volts 25% 12.2 volts 50% 12.4 volts 75% 12.6 volts or more 100% JX BATTERY 8A - 5 DIAGNOSIS AND TESTING (Continued) |