Reverse lights not working fuses are fine and light bulbs are new what next?

Back up light has a 10 amp fuse, fuse number 5, at the back up switch the pink wire should be live (Key On), when reverse is selected the L-GN wire becomes live on a manual transmission car(switch closes), on an automatic the neutral safety switch has power at the pink wire if the fuse is good (key on), when reverse is selected dark green/white wire becomes live if the switch is good. May have a bad switch. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online