WARNING: This is only for 12 volt
pumps!!!! If the fuses are still confusing, go to a truck parts store or a truck stop and get a 12 volt
replacement lamp, just a light socket with two wires coming off of it. Put in a 12 volt light and have him check the wires going to the pump. Light lights up, you have electricity. (BTW, he can just turn the switch to the pump off, take the wires off of the pump, turn on the switch and hold the light wires to the pump line.)
If you have electricity, the next step is to "Bench test" the pump. This means that you disconnect the pump from the water system, put the inlet hose in a bucket of water and the outlet hose to the outside or down a sink drain. Turn it on. If the pump operates then you have a blocked pipe somewhere between your water pump and the closest water faucet. If the pump does not turn on, the pump is dead.
I just went through some of this my self, so post and I'll answer what I can!