today I took the tank off and held back the fairings
fitted my duel 12v powerlet wiring from handlebar to 3cs by the battery
put the tank back on and checked all OK
wired the wire into my 3cs (harder than I thought, without the right crimper)
cut 28mm and 18mm holes into the aux plate greatfully made my weestromer(thank you mate)
fitted both powerlet and 12v outlet to the plate, then secured it to the bike
all works fine and dandy, il add a pic later
*edited to add pics