I thought dash cams were either wired directly into car power (as roadkill mentions) or using the 12v power port (AKA cigarette lighter socket). Running off of USB, which only provides 5 vdc and likely no more than 0.5 amps of power, doesn't sound accurate. I'm not saying that isn't what yours takes, just that it's odd.
And yes, more than likely you are maxing out the current capabilities of the USB port. USB 2.0 is only rated at 1/2 amp, while USB 3.0 is rated at just under an amp. I'm pretty sure our cars only have USB 2.0 sockets. The 12 volt power outlet is capable of at least 10 amps, so if your adapters aren't working I suspect they are defective.
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