Generator On-Vehicle Tests

NOTE: Battery posts and cable clamps must be clean and tight to ensure accurate meter indications.

When performing charging system tests, turn OFF all lamps and electrical components. Place transmission in neutral and apply parking brake.

Load Test
1. Switch Alternator, Regulator, Battery and Starter Tester (ARBST) 010-00725 or equivalent to the ammeter function.
2. Connect the positive and negative leads of Alternator, Regulator, Battery and Starter Tester (ARBST) 010-00725 or equivalent to the battery.
3. Connect the current probe to the generator B+ output lead, circuit 1 A (BK/W).







4. With the engine running at 2000 rpm, adjust Alternator, Regulator, Battery and Starter Tester (ARBST) 010-00725 or equivalent load bank to determine the output of the generator. Generator output should be greater than indicated on the graph. If routed here from pinpoint test, return to pinpoint test. Pinpoint Tests
If not, refer to the Symptom Chart for diagnostic procedures. Symptom Related Diagnostic Procedures

No-Load Test
1. Switch Alternator, Regulator, Battery and Starter Tester (ARBST) 010-00725 or equivalent to the voltmeter function.
2. Connect the voltmeter positive lead to the generator B+ terminal and the negative lead to ground.
3. Turn all electrical accessories OFF.
4. With the engine running at 2000 rpm, check the generator output voltage. The voltage should be between 13.0 and 15.0 volts. If routed here from pinpoint test, return to pinpoint test. Pinpoint Tests
If not, refer to the Symptom Chart for diagnostic procedures. Symptom Related Diagnostic Procedures