I'm trying to figure out if my Zumo car cradle (the suction cup one) is either stupid or broken. My kit didn't come with the car power cable (with the cigarette lighter plug), so I'm trying to brew my own to get power to it. There's a mini-usb on the side, And some other proprietary plug on the other side, On Garmin.com, that proprietary plug is shown on the end of the "vehicle power cable". Yeah, I don't have that one, nor do I want to pay $30 for it. So why not the mini-USB? It should provide power, just like it does via the bottom of the Zumo unit itself when plugged in to my computer via USB (this works, I've updated the unit). Nope, doesn't work. I've tried 3 different USB-miniUSB cables, and plugged them into my car, the wall, and my computer - anwhere I could get juice into a USB plug. In no cases does the Zumo register power going to it via the car cradle. Then the question: is my car cradle busted? If not, wtf is that mini-usb jack for, if not for power?