I don't know if this applies to your situation.
I have a GS6000 (?). When connected to a computer via USB cable, it starts in manual mode and must be switched to record. When the manufacturer provided proprietary power cord is plugged into a 12V accessory socket, it starts and records automatically. Per Foxoffer customer service the provided cord is needed because this dash cam reads the data wires and fires up accordingly. From
http://geopeter.hubpages.com/hub/US...-inside-the-USB-Black-and-Red-White-and-Green:
The Four Wires Inside Your USB Cable
Now, what are the four wires inside the USB cable?
If we try to slice down and do the skinning of a USB cable, you can find four wires, the mentioned wires above, black and red with white and green. These colors, take note, are common with almost all USB cords.
Red, as standard color for positive wires, has 5 volts. (the voltage is similar even if that certain USB cable has different set of colors)
Black is the ground wire as for negative or ground connections.
White is the positive Data passage or in other symbol the DATA+ (data plus) wire.
Green defines the negative DATA pathways or the DATA- (data minus) wire.
I went your route with similar consequences, loss of time and extra expense. I re-wired with an add-a-fuse and ground to loose 12 volt sockets and plugged in the provided cables with a few wraps of electrical tape to hold them together under the dash. I've done this with my GT680W, Garmin GPS, Cobra detector and GS6000 for the rear. The single add-a-fuse serves all devices and each are powered and protected as intended by the manufacturer. I also got a surprise with the Garmin LMT. The box said I needed a special cord to enable traffic reports. When I switched from aftermarket 12V-USB to the provided cord, traffic reports appeared.
Hope this helps, good luck and keep us posted.