Changed out fuel pump, throttle body sensor.

If the pump doesn't run, have to check voltage at fuel pump connector, engine cranking, gray wire. There is an oil pressure switch in the fuel pump circuit, just a redundant power supply to the pump. Once you crank it enough to bring up oil pressure, that switch closes and sends voltage to fuel pump, regardless of the relay. The main voltage circuit for relay and o/p switch comes from the same fuse, if that fuse or fuse circuit is faulty, the pump won't run. Right now, I cant tell if wiring issue or wiring connector or what?