Mazda 3 won't start after battery install?

Hi there!

First off, thank you for your YouTube videos and for providing this service.

The wires on my Mazda were not labeled correctly and while replacing the battery, the grounding/negative cable what repeatedly placed on the positive side of the battery. Light sparks flew and the horn continuously sounded as the sound of what seemed to be a fan raced.

The relay and alternator fuses are in tack. The headlights, wipers, reading lights and gauge lights come on. The door ajar and radio lights don't. The stand alone key fob is inop.