2000 b3000 running issue

my truck was having an issue with running under a load. It would run perfect in the drive way but the minute I took off it would start to spit and sputter put a fuel pressure gauge on it and the pump wasn't keeping up. It was a new pump and the really was good now the truck does nothing. The pump doesn't come on at all and the injectors aren't pulsing (checked with noid lights) so I put a different computer in it still nothing. Any ideas? Anyone have a pin out of the pcm thanks for the help!

Not too familiar with that engine, but you might want to check your fuses and grounds.

Check MAF sensor, and TPS, I am not too familiar with fords, but one of those being bad may cause the ECM to not fire the injectors. Also check your crank angle sensor. How to check them, I dont know, but if you have a Haynes manual, it probably says how in there. You can also get a code reader that displays sensor outputs, I have one, and it shows you all the sensor values that the ECM is seeing in the correct units of measure, if a sensor or something is not correct, it will show up on there.

all that has been replaced

ok so update i got the truck to start again turns out there was i wire that i had spliced into and ran to a chassis ground (per someones suggestion) and it was causing the main pcm power fuse to blow... so i removed that wire and replaced the fuse and she runs again. so im back to my original issue of it shutting down under a hard load (driving over 35 mph or so) the fuel pump wont keep up ive double and triple checked fuses and relays all seem good is there a way to test the grounds at the pump without a power probe? really appreciate the help i need to get this truck running and sold!