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Only way to be sure is to get them both checked at Advance Auto or maybe Autozone. They have a machine that hooks up and puts a test load on them. Both may be bad. A bad alternator will cause your battery to fail and if you are not careful you will lose your starter too. Many will fail with low voltage at startup. Always best to use a battery charger rather than a jump as charging from alternator not good when battery low. Replacing alternator not too tough depending on what you have(year and engine). My son's 94 Beretta (3.1) was so tough I had to have it done at a shop as belt ran through motor mount. Most of the time not a big deal. You can pick up a Haynes manual for 12-15 bucks. It is a good investment if you do not have GM service manuals.
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I used to be indecisive, now I am not so sure.
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