Charging System Testing - ARBST Method

1. Connect the positive and negative leads of ARBST to the battery terminals.
2. Remove the gray amp probe from any conductor and press ZERO AMPS.
3. Connect the gray amp probe around the battery ground cable(s) so that the arrow on the probe points toward the battery.

NOTE: The gray amp probe MUST be secured around all wires connected to the vehicle negative battery terminal.

4. Start the vehicle engine.
5. Press CHARGING SYSTEM TEST.

NOTE: The display must indicate the correct number of cylinders for the RPM reading to be accurate. The ARBST will automatically default to 4 cylinder. To change the number of cylinders, press the appropriate number on the numeric keypad.

6. Follow the screen prompt and adjust the RPM as directed. The ARBST will load and unload the charging system under various conditions.
7. Read the results; press CONTINUE to toggle between REGULATOR VOLTS, PEAK AMPS and DIODE CONDITION.

NOTE: If the amperage remains higher than 20 amps during the test, an asterisk (*) appears near regulated volts on the display. Regulated volts are probably lower than normal because charging current was very high.

Generator Output:

8. Generator output should be greater than shown in the table. If routed here from a pinpoint test, return to the pinpoint test. If not, refer to Symptom Chart for diagnostic procedures. Symptom Related Diagnostic Procedures