Hi crispinchurch, sorry for late reply only just saw this post, I have same plugs as you, bit of detective work found 300w inverter inside near side rear wheel box and also an analogue tv tuner , 2 sets of phono plugs , 1 for tv and 1 for playstation, I removed tv tuner but will replace with digital one when funds allow. I use the other set to run a sony dvd player under passenger seat. I have a switch by handbrake to switch inverter on and off, and switch in glove box to enable hard wired FM modulater for dvd sound. hope this helps if not too late. terry