Dodge Omni/Horizon/Rampage 1978-1989 Repair Guide



A conventional alternator is used. It has six built-in rectifiers which convert AC current to DC current. Current at the output terminal is DC. The main components of the alternator are: the rotor, stator, rectifiers, end shields and the drive pulley.

The electronic voltage regulator is a device which regulates the vehicle electrical system voltage by limiting the output voltage that is generated by the alternator. This is accomplished by controlling the amount of current that is allowed to pass through the alternator field windings. The regulator has no moving parts and requires no adjustment.


To prevent damage to the alternator and regulator, the following precautions should be taken when working with the electrical system.

Never reverse the battery connections.
Booster batteries for starting must be connected properly, positive-to-positive and negative-to-negative.
Disconnect the battery cables before using a fast charger. The charger has a tendency to force current through the diodes in the opposite direction for which they were designed. This burns out the diodes.
Never use a fast charger as a booster for starting the vehicle.
Never adjust an alternator with the engine running.
Never disconnect the voltage regulator while the engine is running.
Avoid long soldering times when replacing diodes or transistors. Prolonged heat is damaging to AC generators.
Do not use test lamps of more than 12 volts (V) for checking diode continuity.
Do not short across or ground any of the terminals on the AC generator.
The polarity of the battery, generator, and regulator must be matched and considered before making any electrical connections within the system.
Never operate the alternator on an open circuit. Make sure that all connections within the circuit are clean and tight.
Disconnect the battery terminals when performing any service on the electrical system. This will eliminate the possibility of accidental reversal of polarity.
Disconnect the battery ground cable if arc welding is to be done on any part of the car.

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Fig. Fig. 1 Alternator and Regulator Specifications


  1. Disconnect the negative battery cable.
  3. Remove the wires from the alternator.
  5. Support the alternator, remove the mounting bolts and brackets if needed.
  7. Slide the belt off the unit.
  9. Lift the alternator out of the vehicle.

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Fig. Fig. 2 Loosen ...

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Fig. Fig. 3 ... then remove the alternator mounting bolts

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Fig. Fig. 4 After the mounting bolts are removed, the alternator can be removed from the vehicle

To install:

  1. Position the alternator on the engine.
  3. Install the mounting bolts (and brackets) if removed.
  5. Install the belt on the alternator.
  7. Adjust the belt by tightening the adjusting bolt.

Never adjust a belt with the engine running.

  1. Tighten the mounting bolts, attach the wiring to the alternator.
  3. Connect the negative battery cable.
  5. Start the engine and observe the operation.