So I decided to go to the main mazdaspeed forum for this. I recently did an engine swap since my previous engine died. It was the same engine of course (FS 2.0L 16DOHC). When I finally bolted and plugged everything back together, I put the battery in, and hooked it up. As soon as the battery is hooked up, ALL of the electronics activate. Since the horn is loud and annoying, I pulled the fuse for that just so I could see if the engine would start. But there is no turnover or any noise. Please help me out!