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Most likely it IS an alternator problem. Sometimes a diode can go bad and the indicator light will come on. Other times the alternator will be intermittently bad or even go over-voltage.

In this case, you should take the vehicle to an auto parts retail store such as Auto Zone or Checker Auto or whatever is in your area. Many of those places offer free alternator diagnostic checkup and they're actually quite accurate. It could be a diode in the diode plate and the alternator is only producing about 1/3 of what it should, in which case you'll have problems under a high current load.

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