v551 hang up cup hack...

I bought an antenna, dash bracket and the hang up cup for my wife's
car. Her car has uconnect which works great with the v551, so I don't
need the rest of the pro installation kit. I'd like to use the hang up
cup just for power/charging and the antenna connection.

The vendor I bought the unit from stated on their website that the hang
up cup can be used without the installation kit but would require
modifying the cable. Before I cut into the cable, is there a source
for the pin id? I'm interested only in the three power pins.

I'm assuming I can disassemble a car charger and connect it up to the
hang up cup cable. Has anyone done this?

Thanks in advance,

Jason