Need some information on 12 pin socket wiring please. For an Easytow trailer with electric over Dexter hydraulic breakaway brakes the wiring diagram states that pin 8 is battery supply (30amp) and pin 10 is earth (30 amp) My question is, is this for charging the breakaway battery and if so that means I will have to fit a DC to DC charger on board the tow vehicle (it is fitted with a smart alternator) but if I was to charge the break away battery with a battery charger regularly can I do away with these 2 connections.