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Socket and plug wiring instruction
12N Normal Socket		12S Supplementary Socket
1)	Left indicator	1)	Reverse
2)	Fog	2)	Battery Charge **
3)	Earth	3)	Earth
4)	Right indicator	4)	Power feed
5)	Right side light	5)	Spare
6)	Brake	6)	Fridge **
7)	Left side light	7)	Earth for pin 6 (1998 on)
**NB It is essential that pin 6 is wired through a split relay from 1998 on!!

check also the negitive or earth wires to the inside of the lights after removing the lens.spray plug with WD40 and clean pins.

Connect a 12volt battery to pin 3 earth ( negative ) and pin 6 brake ( positive ) on the caravan black plug and see if the brake lights work . If they do you either have a faulty pin connection between plug and car socket or maybe a blown fuse in the car , do the car brake lights work ?

atb

Wizard 

we have a swift too

we found that our back lights went off and they kept blowing the fuses in the car

in the end my hubby looked inside the lights on the van and the wires needed sorting a think they were slightly touching or something like that x

once hed sorted the wires the lights were fine x

Connect the car up and use a multi-meter at the brake light bulb connection , do you have 12.7 volts there ( remove all brake light bulbs first ) . If you do now try the same again and put a brake light bulb in , what voltage reading do you get now , if the voltage is low you have a bad connection , if you have 12.7 volts or there abouts i'd say it's a bulb fault .
Did you try what i suggested in my last post . You could just run 2 wires direct from your car battery .

atb

Wizard

Where does the brake light wire change from 1 wire to 3 separate wires? In a junction box near the lights??
It usually splits at the rear , goes from one light to the other and then to a high level one if you have one .

atb

Wizard

Not trying to teach my Granny, please don't be offended, but you have got the car ignition on when you check the brake lights, haven't you?

Only I've lost count of the times when I've been checking friends lights for them after they've hitched up and they haven't turned the ignition on so the brake lights don't work!