Since most people don't use the ashtray anymore, but you always want to charge your phone or navigation system, this is the perfect place to hide a USB connection. Nicely out of sight when you don't need it, and easy to pull out for use. 

This smarter QC0 2.0 / QC 3.0 charger works at both 6 and 12 Volts and has a maximum output power of 18Watts and at 12 Volts it is even a fast charger of 3.5A if your phone supports it. In other cases and at 6 Volts it charges with a standard strength of 1 A. Easy to build in and to connect.