Drive down to AutoZone or Advance Auto and have them put their battery/alternator tester on it. They can test the battery for condition as well as test the alternator output with an induction pickup while it is running. If they tell you to take it out of the vehicle to have it tested, DON'T DO IT! On the phone, they told me to take mine out, and when I got down there neither had the correct cable to put it on their machine! Then they had the nerve to say, "you should have left it on the vehicle, it is much easier to test that way". Beyond that, make sure all your grounds are solid and nothing is on, interior lights etc..
Hope that helps - Bill
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