This is the plug that I used for that socket, but as far as I know it's only meant for light loads such as a satnav, which is what I use mine for. No doubt someone else will be able to clarify that point.
Plug and Play! R NINE T (2015 on) R1250RT R1200ST R1200S R1200R S1000R WIRING Wires are numbered and need connecting as follows: No 1 lead earth ( Black lead ) No 2 Not in use No 3 to red lead on sat nav ( Red Lead 12v ).
Looks like it could be used as an ignition switched trigger for a relay if you fancy a bit if DIY wiring.
If not then a Healtech Thunder Box might be the easiest way and much cheaper than an EZCan.