Uss
Tuned and Synch'ed
The multimeter reads 11.8V with ignition on (without motor running) on the connector. The Blue is ground and Green is Power.What does your multimeter or voltmeter say? If you don't have one, just connect a small 12v bulb between each of the terminals to determine which has the +12v. I think you'll find it is the green/yellow connector.
Did the USB include the connector with the colours switched as shown in your photo? This is connected wrong for a powered device as far as the colours are concerned. But I personally wouldn't proceed any further, and return to the dealer for a full refund or replacement.
The USB did fire up after we switched the connections with the aid of some spare wire length but it came the way it is so yes you are right. It is going back for a full refund which the dealer has already generously offered. Plus it doesn't stow anywhere on the Eldo like it says on the installation instructions so no point replacing it.