Welp, I got everything important wired in, and the 4t80e swapped car wont start. Its not the battery, cause I'm using the one out of my daily. I had to extend some of the small guage wires to the starter, and relocate some ground wires. When I tried to crank the engine without the fuel pump relay in order to cycle the water pump, oil pump, and trans, nothing happens. When I turn the key to ON, all the dash lights come on, and my trans controller lights up, but the starter wont do anything. Does the PCM have to have a signal from the trans to know its in park/nuetral so it'll start?

 

Okay, a bit of a jump on my part. I completely neglected the external neutral safety switch on the 4t80e. I can jump the starter (crank) relay, but I'm having trouble getting it to idle.