I have a 2016 Chevrolet Equinox. It was having trouble cranking up so I went and had the the battery checked at a local parts store. Battery tested fine but needed to be charged up. Last week it would crank up again. I changed the alternator today and charged the battery again. I just bought the car in March and it has 82,000 miles on it. Is there anything I’m missing before I take it to the dealership. They want $200.00 to even look at it. Any help would be greatly appreciated.