QuestionI have a 97 dodge neon that burns out an alternator every six weeks or so. first the charge light comes on then the large cable from the harness that goes to the back of the alternator burns through about 6" to a foot from the alternator. When I get the alternator tested it appears that the internal voltage regulator is fried. I don't know where to start looking for a short. any ideas?
AnswerCHARGING SYSTEM
The charging system is an integral part of the battery and starter systems. Since all of these systems work together, any diagnosis and testing should be done in conjunction.
The charging system is protected by a 12 gauge fusible link located in the A11 circuit. This fusible link is between the generator and the starter.
The generator ground is provided through a case ground in the generator to its attaching bracket. This generator uses a voltage regulator internal to the Powertrain Control Module (PCM)
When the vehicle is running, battery voltage is applied to the generator field terminal through the A142 circuit. This circuit is the output from the contact side of the Automatic Shut Down (ASD) relay. The ground, or voltage regulated side, of the generator field is controlled by the K20 circuit which connects to cavity 4 of the PCM connector.
When there is current present in the field, and the rotor is turning, the stator in the generator produces a B+ voltage that is supplied to the battery through the A11 and A0 circuits. The A11 circuit is connected to the output terminal of the generator and connects to the engine starter motor battery feed terminal. The A0 circuit is a direct feed line from the battery and connects to the engine starter motor.
Grounding for the system is accomplished at the battery negative terminal. These grounds connect to the engine and body.
HELPFUL INFORMATION
Inspect for a blown fusible link in the A11 circuit between the generator and the starter motor.
For additional information on charging system diagnosis, refer to the appropriate section in the Manuals Tab.
