Looking for some help with a battery/electrical issue. My car sat all winter and when I went to start it up the positive battery terminal sparked and I lost all power. All the courtesy lights went out. The battery then would not accept a charge. It was pretty old so I decided to replace. I installed the new battery and the car started up briefly. I went to crank it over again and it was getting ready to start and then the battery sparked and everything went dark. This new battery also seems to be fried as it won’t take a charge. Any suggestions around how to test what might be causing this to happen? Thanks in advance!