Hi Linda
The switch for the water pump is on the panal that shows battery level, water level etc as seen in the attached picture. He guy I bought it from only had it for a few months because his wife can't drive a standard. He is going to see if he still has the number of the older gentleman that owned it for almost 25 years. I'm very happy with it. It only has 30,000 miles on it. I just got it and plan a bunch of upgrades before taking it on the road. I read that it might have different bolt patterns on the front and back wheels. I will check in the morning. I hope not. I don't want to have to carry two spares. Please let me know if you find any source of information on the cabin or owners manual. I have had no luck so far. It was built by General Coach out of Oliver British Columbia Canada but went out of business in 2007. Thanks for contacting me.