I went the cheap way and bought one off amazon for like 4 bucks. I travel a lot so I use navigation and a combo of bluetooth and streaming my NY radio stations. When I run any one of the two, I wotn even mention when I am running all three, the power drops while it is plugged into the charger. Now it seems to be making a noise when it is plugged in. Lesson learned. What car chargers are you guys using?