anyone really good with s14 electrical

[IMAB3AST111]

ok so i swapped the motor (ka24de) my computers and wire harness into a new shell and the damn thing wont start i asked my friend about the computers since i swapped the ignition so my original key would work i got all the parts i needed today and had eight of my friends that worked on cars before trying to help me start the damn thing we checked the battery and tried starting but nothing no matter what we tried everything and theres a little wire that is connected to a plug on the motor and i cant find where it goes and then theres two wires by the fuse box that my friend said a computer should connect to it but cant find it anywhere. if anyone could help me it would be great and the car was running in my other shell in the winter so idk why it wont start and it was sparking at us when we disconnected the starter ground wire and tapped it on the motor please help some one im about to sell this damn thing if it wont start

[IMAB3AST111]

OK dont read the other posts so i got an electrical god to come down and help me out and turns out my friends are dumber than i thought. my freind stopped up and takes one look and the wires i couldnt figure out where they and plugs them and re runs all the ground wires and everything and one click on the key and she clicked and then we noticed the battery cable was lose ha. we tightened them down second try she started right up and we let it run for about five mins turn it off. then we go to start it again and it just turns over but wont start now any one got suggestions thanks