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almost every auto shop will test a battery and alternator for free ...your battery should read 12V with the engine off.
a good way to test the alternator is load test it while having a multimeter hooked up to the battery. *run it with no accessories on, then 1 by 1 turn on the radio, wipers, headlights, heater, a/c, etc. until you have run them all together.
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