[Richard]

Ok, you may find me to be a frustrating old cuss. I deserve it, but rather than tell you which wire goes where, I feel it is far better if you understand what you are doing. Let's start with this quick sketch of how the air system connected to your 120V pump could be plumbed.

   

Let's walk through how it supposed to work. The four way manifold that connects the storage tank, the grey covered well pump switch, other supply lines to coach (yellow), and eventually the 120V pump is key. 

In the diagram, looking left of the manifold, you will see a one way check valve, or possibly a three way valve. 

When the pump is running air will flow through the check valve or three way into the manifold. Pressure in the system will be read by the well pump switch on top of the manifold. When the cutoff pressure is reached, the power to the pump will be interuppted by the well pump switch. The check valve will prohibit air from flowing backwards and pressurizing the pump. Or, if you have a three way valve it will change positions, blocking the flow of air back to the pump, and releasing air pressure from the pump to the three way. 

There must be some mechanism between the 120V pump and manifold to 1. release pressure on the pump so that the next time it starts, it is not starting against high pressure, 2. prevent the pressure in the system from escaping due to mechanism number 1.

That being understood. The first wiring to understand is the wiring for the well pump switch and the 120v Pump. Simply put the pump runs off the standard two wire 120V setup that a house lamp does. On one side of the two wire cord, the well pump switch is placed in line with ONE of the wires that supply the pump. When the pump switch goes below 70, the contacts in the switch will close, making the circuit, and the pump comes on. When the pressure reaches 90, the contacts open and the pump turns off.  If you find that the previous electrician has wired both sets of wires through the well pump switch, let us know and I will modify the text below. Both methods work.

Ok, now what to do about the wiring of the 3 way valves. You have to go back to the diagram and understanding of how the system is supposed to work. You want one or both of the three way valves to CLOSE when powered up. If the three way is at the bottom of the separator it should close when powered. If you have a three way in line before the manifold, it should close when powered so that the air flow is from the pump to the manifold and not to the atmosphere. 

That being said, one or both solenoids will be powered any time the pump is running. So one lead of the solenoid goes to common, and the other lead is connected to the pump side of the well pump switch. That way when the switch closes, the solenoid will have power.

You do NOT need two three way valves. You need a check valve and the solenoid on the bottom of the air water separator. You can use two three way valves if you do not want to use a check valve.

I assume that you will follow electrical safety precautions by opening breakers, and confirming no voltage with a voltmeter before beginning. 

In my opinion, you have some clean up work to do where hose and clamps were used where DOT compliant hose and fittings should have been used. 

I hope this helps.