First thing I'd do is go to Advance auto. They have a machine that will test both your battery and your charging system. Free of charge. If the alternator is bad, the test will tell you.
An even better test would be for you to remove the alternator and take it in for a bench test. It's even more accurate than the in-the-car test.
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2005 Excursion XLT 4x4 with 5.4 3V & 4R100
1989 F250 XLT Lariat SuperCab 4x2 with 460 & C6
1987 Crown Vic Two Door with 5.0 & AOD
1986 Yamaha V-Twin Virago 1100
For my sanity, please try to use punctuation and capitalization. I try to help the people who post, but it's impossible to do when the post is indecipherable.
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