No power going to Fuel Pump after replacing. Checked reset button Any other?

We checked the wires on switch and it had power at first then my tech giggled ignition and it didnt. We are at a loss right now. Switch is down (red button)

Check voltage at inertia switch 'WHILE' HELPER CRANKS THE ENGINE .. Should have battery voltage on BOTH wires..'AS LONG AS' the engine is being cranked by helper..... Was the fuel pump ASSEMBLY replaced or just the pump itself?

We replaced all and hooked direct power to pump and it works but no power at pigtail. How many volts should pushed through switch