Articles about reversed wiring
How to Test and Repair Outlet Wiring – Having a Circuit Analyzer style plug in tester that will check the power and polarity of your home receptacle outlets is invaluable.
How to Identify and Repair Reverse Polarity of an Electrical Circuit: Electrical Safety and Proper Circuit Polarity, Polarity has to do with the flow of electricity. Polarity and Outlets, Circuit Wires and Polarity.
How can I find out why my outlets are not working? How to Identify Electrical Wiring Problems with Outlets, Checking Outlet Wiring, Troubleshooting an Outlet Circuit.