I got a 2004 blazer 4.3 4l60e ran fine swapped tranmission now won't crank no power to fuel pump but can jump it with a screw at starter will turn over replaced the safety neutral switch and ignition switch all wires seem to be inplace and all I'm lost on this thing please help

 

Assuming you swapped the transmission with an exact replacement and same specs what comes to my mind is:
forgot to reconnect some wires?
pinched wires?
blown fuses?

 

I've checked all fuses and had the wire tied back out of the way to keep them from being pinched

 

Pull the crank fuse and see if you get 12v at the fuse holder blade when you put the ignition key in start.

If yes then replace the fuse and do the same on the ppl wire at the NSS.

Report back and we will go from there.

George

 

I have 12.3 v at fuse replaced it have .07 v on purple wire at safety switch

 

As long as you’re sure that you were measuring the solid purple wire and not the purple and white wire down at the neutral safety switch, and you were measuring with the ignition in the start position then your problem is the purple wire from the fuse box down to the neutral safety switch. I would examine that wire loom to make sure you didn’t pinch anything or you don’t see any obvious corrosion. If that comes up empty, then unbolt the fuse box and gently lift it up without stressing it too much and look and see if there’s corrosion or any problems underneath.. If you still don’t find the problem, then we’re gonna need to run a new wire which I can help you with. Keep me posted.

George

 

I'll recheck again to make sure and could I run a jumper wire to make sure before I run a whole new one

 

That’s a good plan, just make sure the jumper wire is fused

George

 

Fuse box looked good gonna try jumper wire and let you know

 

Got nothing with a jumper wire