'06 Rear wash Switch - Which Wires/Which Pins?

MIB said:

I'm modding a spare rear wash switch for my '06 Defender (rectangular shape - fits in centre switch panel)

I have a new switch and a brand new plug to allow me to wire up this extra "accessory".

Which of the 5 pins gives me:

switch earth (-)?
Power "in" from fuze
Power "out" to gadget?

I can pull the first two from it's neighbour - the "real" rear washer switch, but I need to know which is which.

Thanks.

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