We bought a 1991 Scamp
and were assured of a very large amount of maintenance had been performed, only to find out that most of the unit was in trouble, including the pump. When I hooked up the water we had more than one leak and water everywhere.
Before you go to any trouble installing your bargain pump, hook it up to a battery
and test it in the yard using your garden hose as see if the main seals are tight.
Next, take the model number from the pump sticker and look up the features from the manufacturer so you know what you're working with before you start.
Next, read the basic wiring information regarding 12v electrical
so you understand the basics of the wiring system and THEN look into the existing wiring of your current electrical
system to be sure you have good stuff to work with...the wiring on our scamp
was so bad in some parts that the insulation was brittle and falling off (outside plug to the tow vehicle).
We bought a new pump online and installed it with a toggle switch that can be used to shut it off when we don't need to use it, despite the claim from the manufacturer that the pump will shut off automatically once it achieves the proper pressure levels. I just wanted to be able to shut it off when not using it, so...
I realize that this is way more information than you were asking, but I learned by making mistakes that I had to uninstall a bad pump a second time, so I thought I'd offer you the benefit of my problem pump.