Mobile Home Electrical Switch and Outlet How to find an Open Circuit
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Mobile Home Receptacle Outlet and Switch
Mobile homes use a "one piece" style electrical outlet box that, if you open it up and look, compresses the wire together in a "v" shaped slot. These I find over time will break connection due to heating up from the current load being passed through them. I can usually troubleshoot this problem by merely tapping on the wall next to receptacle outlets or switches on the mobile home electrical circuit that has either quit working or is working intermittently and see if this causes the lights to blink. The scientific method is to determine in which direction a circuit is connected and using a volt meter find the last receptacle outlet that has power. A quick and easy way to find the outlet causing the problem is with a circuit tester. It can find open hot, neutrals and grounds (look at bottom of page). Chances are that the open circuit problem is at this outlet the last one that has power, preventing the passing of electrical current to the rest of the circuit. These can be replaced with same type found at a mobile home supply. However I prefer to remove the original type of device and install what is called a snap in box (also called an old work box) and then install either a receptacle outlet or switch of the standard home type to keep the problem from returning. I also feel this is the safest way to do it. Be sure to wrap the wire around the screws and not use the quick wire hole on the back of the device. Remember white wire on the silver screw, black wire on the brass screw and ground wire on the green screw. In the mobile homes I have owned I replaced all the switches and receptacle outlets when I first got them. This repair can be done with less expense than you might think, if done by you provided you feel comfortable doing this yourself. Example of a single gang snap-in box, mobile home style outlet receptacle and switch insides below with a view of how the wires route through a mobile home style receptacle and switch, without the outer Romex insulation for easier viewing. Look here for additional three way switch wiring and here for single pole switch wiring information. 
Circuit Testing
A must have circuit tester like the one pictured below is a real problem solver. I would not have been able to find problems as easily as I have without one. You can get them here they are less than $6.00 and worth their weight in gold.