It says my battery was changed in March of 2018, and it's been garage kept. The car is a 2010 and now has 33k miles. Is the alternator on the chopping block or is it just the battery? How do you know if the alternator is going bad?
Thanks guys

 

You need a multimeter to test out the voltage on the battery terminals, when the car is turned off, and then test again with the engine running. This will tell you if its the battery or the alternator that is weak.

Also many auto parts stores test these parts for free

 

Probably the battery, 33k is pretty low for an alternator. I had a new Interstate battery for only a year and it went bad, my GS350 is garage kept too in Cali. It was just a defective battery. See if your battery has a warranty and take it in.

 

Hard to check a battery with a multi-meter because that wont put a load on it. he could have a bad cell or two and a multi meter wont show that. Just take the battery in for testing or warranty replace it, if its from 2018.