Well, I had an awefull experience today driving my car and I need help on how to fix it.

I recently installed a spoiler with a LED light myself to my car. When I went to drive the car today, the car freaked out and seemed possessed. The horn started blaring and lights started going crazy. I pulled over and disconeccted my subs and spoiler but yet the horn wouldn't stop blaring. (The car is off before I disconnected). I saw a little amount smoke when I opened the door near the fuse box inside the car. So after I did that and nothing worked, I opened the fuse box under my hood and took the Brake/Horn fuse out. That killed it obviously. I drove home with the car with no electronics and lights.

Help? What Happened?

Sounds like your alarm has been activated. Did you open it with the fob or the key?

It was while driving, sorry forgot to add that.