you dont mention twin electrics or is it single electrics????,14 point connector?
A1 and witter wont give you details m8----unless you buy from them,
what type of ball you using?? you need the fitting kit! 7 core cable etc,
£100 aint bad for the peace of mind and pro fitting, if you aint fitted on e before good luck-last question where are you picking your power supply up from????? -----------if you dont know this-DONT FIT!!!!!