Breeze, Cirrus, Sebring Convertible and Sedan, Stratus Sedan, 1999-2005

Voltage Regulator


The Electronic Voltage Regulator (EVR) is not a separate component. It is actually a voltage regulating circuit located within the Powertrain Control Module (PCM). The EVR is not serviced separately. If replacement is necessary, the PCM must be replaced.


The voltage regulator is integrated with alternator and is not serviceable or adjustable.

Testing & Adjustments

Battery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.

  1. Before servicing the vehicle, refer to the Precautions section.
  3. Disconnect battery negative cable from remote negative terminal on shock tower and properly isolate to prevent accidental reconnection.
  5. Always be sure to check the following before the test:

    Alternator installation
    Check to be sure that the battery installed in the vehicle is fully charged.
    Alternator drive belt tension
    Fusible link
    Abnormal noise from the alternator while the engine is running

  7. Turn the ignition switch to the LOCK (OFF) position.
  9. Disconnect the negative battery cable.
  11. Use Special Tool MB991519 (alternator test harness) to connect a digital-type voltmeter between the alternator "S" terminal and the ground.
  13. Connect the positive lead of the voltmeter to the "S" terminal and connect the negative lead of the voltmeter to a secure ground or to the negative battery terminal.
  15. Disconnect the alternator output wire from the alternator "B" terminal.
  17. Connect a DC test ammeter with a range of 0-100A in series between the "B" terminal and the disconnected output wire. Connect the positive load of the ammeter to the "B" terminal and connect the negative lead of the ammeter to the disconnected output wire.
  19. Reconnect the negative battery cable.
  21. Connect an engine tachometer or the scan tool MB991502.
  23. Turn the ignition switch to the ON position and check that the reading on the voltmeter is equal to the battery positive voltage.

    If the voltage is 0 V, the cause is probably an open circuit in the wire or fusible link between the alternator "S" terminal and the battery positive terminal.

  25. Check to be sure that all lights and accessories are off.
  27. Start the engine.
  29. Increase the engine speed to 2,500 rpm.
  31. Read the value displayed on the voltmeter when the current output by the alternator becomes 10A or less.

    If the voltage reading conforms to the value in the voltage regulation table, then the voltage regulator is operating normally.
    If the voltage is outside the standard value, there is a malfunction of the voltage regulator or the alternator.

  33. After the test, lower the engine speed to the idle speed.
  35. Turn the ignition switch to the LOCK (OFF) position.
  37. Disconnec