probably going to Hell for this, but where is the switch to the pump out?

[sluggo]

I know I know, but we do not have a pump out over here for 50 miles, so we have to pump out!! I found the sea cock valve and cut the wire holding it closed. Lightning did not strike, thank God!. I turned the breaker on under the steps, I followed the electrical diagram, and found a relay wire unplugged, so I plugged that up. In the wiring diagram, it notes (I believe) a switch. I cant find that switch to activate the pump. Does anyone know where it is?? Could my tank be too empty to pump? Is there another something somewhere I have to hook up??