I was installing remote starter to it. While I was attaching tach wire to car tach wire, it spark little. And then car wont start. It is cranking but not starting, feeling not enough power. I check the battery. It is clean, voltage is 12.4V. Installed new starter relay.

Any suggestion, what should i check next?

 

I checked all fuse, replace starter relay. It wont start. Then I found that EFI fuse was blown. I changed that fuse. Then battery was dead. I did jump start with other car. But it wont start.

Any suggestion what should I check next?