1. Disconnect the negative battery cable. Refer to

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
2. Connect a multimeter in the circuit at the "BAT" terminal of the P72 generator or the positive DC output terminal of the P92 generator.
3. Reconnect the negative battery cable.
4. Turn on the radio, the windshield wipers, the headlamps (high beam), and the blower motor at high speed. Connect a carbon pile across the battery.
5. Operate the engine at 2500 rpm and adjust the carbon pile as required in order to obtain the maximum current output.

Important: Initial voltage buildup is caused by residual magnetism in the rotor. Increase the speed as required in order to obtain maximum current output.

6. If the ampere output of the Delco-Remy generator on the P72 chassis is 105 amperes (± 10  amperes), or if the ampere output of the Leece-Neville generator on the P92 chassis is 200 amperes (± 10  amperes), the generator is OK.
7. If the ampere output is not within 10 amperes of the proper output, replace the generator. Refer to Generator.

Tools Required

1. With the engine and all the accessories off, measure the voltage across the battery terminals and note the reading.

NOTICE: Leave the electrical accessories off in order to prevent high voltage damage.

2. Start the engine. Run the engine at approximately 1,000-2,000 rpm with the voltmeter connected to the battery terminals.
3. Connect a short jumper to the alternator negative output terminal and to the shank of the 1/32- inch drill bit (or stiff paper clip wire).
4. Insert the drill bit (or wire) into the full field access hole as far as it will go and read the voltmeter. Note the reading.
5. Connect the voltmeter across generator AC terminals 1 and 2, 1 and 3 and 2 and 3. Make sure the voltmeter is able to read the AC voltage. Compare the readings.
6. If the readings are approximately the same, the stator is OK.
7. Remove the jumper and the drill bit (or wire) from the generator as soon as the AC voltage readings are obtained.

•	If the DC voltage is higher in Step 6 than in Step 1 and the AC voltages are approximately the same, then the generator is OK and the stator is OK. Continue with the regulator adjustment. Refer to Voltage Regulator Adjustment.

•	If the DC voltage is higher in Step 6 than Step 1 but the AC voltages are not approximately the same, then the generator is not OK due to a defective stator or rectifier.

•	If the DC voltage is lower or the same in Step 6 as in Step 1 and the AC voltages are approximately the same, then the generator is defective, even though the stator is OK (only if the batteries are at least 95-100 percent charged).

•	If the DC voltage is lower or the same in Step 6 as in Step 1 and the AC voltages are not approximately the same, then both the generator and the stator are defective.