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1E – 12 ENGINE ELECTRICAL BATTERY LOAD TEST 1. Check the battery for obvious damage, such as a cracked or broken case or cover, which could permit Caution: Do not charge the battery if the hydrometer 2. Check the hydrometer. If the green dot is visible, go to the load test procedure. If the indicator is dark but 3. Connect a voltmeter and a battery load tester across the battery terminals. 4. Apply a 300-ampere load for 15 seconds to remove any surface charge from the battery. 5. Remove the load. 6. Wait 15 seconds to let the battery recover, and apply a 270-ampere load. Important: The battery temperature must be estimated 7. If the voltage does not drop below the minimum listed, the battery is good and should be reinstalled. If GENERATOR OUTPUT TEST 1. Perform the generator system test. Refer to “Gener- ator System Check” in this section. 2. Replace the generator if it fails that test. Refer to “Generator” in the On-Vehicle Service section. If it Important: Always check the generator for output be- 3. Attach a digital multimeter (a), an ammeter (b), and a carbon pile load (c) to the battery (d) and the gen- D102E301 Important: Be sure the vehicle battery is fully charged, 4. With the ignition switch in the OFF position, check and record the battery voltage. 5. Remove the harness connector from the generator. 6. Turn the ignition switch to the ON position with the engine not running. Use a digital multimeter to 7. The reading should be near the specified battery voltage of 12 volts. If the voltage is too low, check 8. Attach the generator harness connector. 9. Run the engine at a moderate idle, and measure the voltage across the battery terminals. The reading 10. Run the engine at a moderate idle, and measure the generator amperage output. 11. Turn on the carbon pile, and adjust it to obtain the maximum amps while maintaining the battery volt- 12. If the reading is within 15 amps of the generator’s rating noted on the generator, the generator is good. 13. With the generator operating at the maximum out- put, measure the voltage between the generator 14. Check, clean, tighten, and recheck all of the ground connections. |