connect rear power socket

[gripper10]

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ok, after reading some stuff, thought i'd have a go a fitting a rear power socket in the back of my 2004 connect (T230LX). nothing flash, the cigar lighter type. lead to believe that the plugged wiring is already there in the side panel... check it out, buy the opposite sex plug and you're half way home. the biggest problem i could see was finding the right slot on the fuse box to activate..... after a couple of minutes of searching, i found not one, not two, but three redundant connectors...'doh'!!
photos show what i've found.
the 1st 2 pictures (lets call it plug A) seems to have a black and a green/black wire.
plug B in the next 2 pictures was tapped up and has a white and a pale blue wire.
plug C. is a bigger effort with a white and yellow a wire.

does this mean anything to anybody out there???
do you know the number or style of plug to order, or just cut and make my own connections.
and the fuse slot lottery. any ideas?
thanks for any help or advise.!!

[Graham Taylor]

One could be for a speaker, wires for this are usually thinner.

connection for 12v aux should have slots for three connectors (look up cig lighter and check.

No idea what third could be for

[paul2012]

This one is for rear 12v power point

[John235]

Fuse should be F50 15 Amp, behind glovebox.

[axxeman]

This one is for rear 12v power point

What's that socket called and where could I get a male plug for it please?