I've ordered a couple of those white plugs (1 spare) from the site you recommended, Graeme. Thanks.
Nod, I need a trigger wire in the 12 pin for the Redarc Manager 30 charger system that is now standard (but not the breakaway wire, as you wrote). I'll run one from the rear power outlet to do that (unless there is one already in either of the existing trailer sockets). It needs to be ignition switched.
I'm about half way through the install thread, and have come to the conclusion that I need at least 1 resistor in an indicator circuit (preferably both sides) to activate the trailer functions on the Disco. I also need a diode to prevent backfeed in the brake controller circuit. Some excellent information here.
Meanwhile, more phone calls tomorrow to Redarc and Al-Ko. :D
