Ignition Issue

[67ChevNut]

Hey guys, looking for some help.

My C10 won't start, won't even do a click when I turn the key. I have replaced the starter, the ignition switch, the battery, all is new. The wiring that goes to the starter is not that old either, bought it new at some point. My truck has a 350 tbi engine, the fuel relay won't click and the fuel pump is not working either.

I have replaced the ecm too yesterday, from a working suburban. Still not even clicking when I turn the key, lights do work though, but not the signal lights, I don't know if that matters or not. I tested the purple wire with a light tester, there is not voltage apparently in it with the key turned. I checked for bad fuses, the fuse going to the starter is good, and the fuses inside the cab. I should add that I also added an extra ground wire from the frame to the battery. I spliced it together with the one from the engine to the battery.

Truck starts if I jump wire the selenoid, directly from the starter. It would only start for a second or two since there is no fuel supply, I have to use starting fluid just before jump wiring it.

What else should I check? I have not checked the junction box wiring that is by the fender next to the battery. What should I check there? I am hoping the fuel pump is not working because it isn't getting voltage due to a wiring issue, not sure at this point if the fuel pump is bad yet.

I am sure feeling frustrated with this truck right now. I hope you guys can help me, I will certainly appreciate it.