When I connect my Garmin Nuvi 200w to my car to charge it does not work. It just receive charge but does not work. If I disconnect it the GPS It work.

Are you using the garmin power cord or are you using an aftermarket cord? Some after market cords have usb plugs that although they plug right in to the power port on the unit, they tell the unit that you are updating the database. The unit displays only a picture of a computer connected to the unit and that's all it will do. Their is a way around this. Simply wait until the unit displays the about photo of the computer attached and then unplug the power cord from the unit. After the screen clears immediately replug in the power chord. This must be done quickly before anything appears on the screen. If you're too slow, simply repeat this step until you manage to replug the unit before anthing appears on the screen. Once plugged in as about the unit will operate normally on the external power source until you either turn it off or unplug it. Simple repeat above when ready to resume use.