I've concted the cradle with the wrong transformer and the unit does not turn on, I may have burn it, please help!!!!!

While it is true you may have done just this. There is a few things you can attempt to see if you can put this unit right again. Its a long shot.

Remove the internal battery should there be one, such as a battery pack or button cells. Leave those out for at least an hour. Also remove any internal memory card, this may be under the battery pack.

Later, when its time, reinsert the memory card if you took one out. Reinsert the button cell battery and/or the battery pack.

These batteries hold information while your unit is unplugged and the memory card holds maps and data for the maps.

Place the device in the cradle and see if it boots up now. This should take an hour or a bit less, you can push it to as little as 30 minutes.

If nothing happens and you smelled burnt lacquer inside when you removed the battery, the primary power system is fried.

Hopefully you'll come out unscathed, but I really doubt that. Lessons learned are always a bit painful.

Regards,
Worldvet

Ouch, it is highly likely that you have overpowered the gps and it will need some internal repairs. If the item is less than 1 year old Garmin may fix it for you at no charge. If it is over 1 year old you can call them at 1-800-800-1020 .. It would probably be a good idea not to tell them that you may have caused the problem. We would not want you to void your warranty. Sorry for the bad news and please dont forget to rate me. Have a nice night.
Mike