How to test fuel pump

I will give a background to my problem. I went and gave my car a good wash and scrub (did not wash anything under the hood) well while I was driving home the car shut off like I had stalled it or something. Well, I tried popping the clutch as I have had some issues with my battery dying recently (my first ever car) now it turns and will not start. I have a kill switch that is wired to the fuel pump, and the heating system I believe. But, I have no idea where the wires go so I cannot see if that is the problem or what. Just wondering what I could do to trouble shoot the problem?