Three alternators is real common, ... On GM cars. Chrysler has very little trouble. It sounds like there is some other intermittent problem. If you can catch it when it is acting up, the place to start is by measuring the voltages on the two small wires on the back of the alternator. This must be done with the engine running. No voltage will be there when the engine is not rotating, (cranking or running).
One terminal must have full battery voltage; the other one should have less than battery voltage, but not 0 volts. That second voltage will determine the next step in the diagnosis.
Caradiodoc
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Wednesday, January 13th, 2010 AT 5:53 AM