Radio Flyer Ripper Battery Powered Car

It was amazing when we first got it. My so. Loved it. 5 year olds dream car. Power and roomy. But sadly it would not start anymore after a couple of uses. At first I thought it was the battery but after many charges I decided to check the fuse in the battery. The fuse was good and I even swapped it out. I checked the battery and I got 12v. So it’s something in the car itself. I will try to see if u can figure out what happened my son is very disappointed. I want to fix it before summer. Or I will have to dish out a couple hundred bucks.