I'm doing a k24k20 build and I have the engine reinserted. I did an oopsie and didn't reconnect one of the grounds, and reconnected the battery. Bunch of sparks flew yadayadayada.

upon trying to start her up, there's no lights on the dash, no crank no start, interior lights don't work, etc. I tested the battery and it's good. I cam hear a hum from the left side engine bay but I don't know what the part is called. I'm wondering if I fried my ECM, if some wires might be disconnected or Whats going on

 

I don't have a wiring diagram for 2005, so hope someone chimes in. There is "usually" some kind of fusible link in the battery connections, but if you didn't connect everything that might not have saved you (depending on exactly what you didn't connect).

I'm going to move this to General Tech, because it's not really about engine "internal".