Hi again,
Finally, I have bought this AC charger
Garmin AC Adapter Cable f/ nuvi 5000 Series en venta en eBay.es (finaliza el 01-sep-10 08:38:09 H.Esp)
I hope that it will go fine. I will comment about it when I have tried it.
See you soon.
P.D.: Does anyone know what is the microusb in the car mount for?