Just like your house has two 120 v legs for a total of 240 volts, so does your trailer. The 4 prong plug has two hot prongs (120v each), one neutral prong and one ground. So half of the trailer is on one side of the plug and the other half is on the other side of the plug. And since you are self admittedly clueless about electricity, please don't mess with it until you ask here first!!!
