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I agree. My first step would be to check and clean the electrical connections to the alternator and the battery. I would also check the grounds in the engine compartment. If one had a voltmeter, checking the battery voltage at rest and then while the engine is running would also be useful.

It would be interesting to know if the battery light goes out if the engine is rev'ed to a high RPM. Often if an alternator is getting "weak" due to a short in the winding or something, higher RPM will make the light go out.

In the old days, a slipping belt could also be the cause; however, since the advent of belt tensioners and serpentine belts I have never seen belt slippage sufficient to cause a charging problem.
 
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