how can I tell if u need battery or alternator?

Asked by GuruFRLPS May 01, 2020 at 06:57 PM about the 2005 Hyundai Sonata

Question type: Maintenance & Repair

I just bought the car a few days ago and it was
acting like it didn't want to crank if it sat too long
and I can't get it to crank today I don't know if it's
battery or alternator?

1 Answer

Use a voltage tester. With the engine running you should see about 13.5 to 14.5 volts across the battery terminals for a good alternator. With the engine off you should see about 12.5 volts at the battery if if is good.

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