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Have a look here

 http://www.bailey-caravans.co.uk/handbook-archive.htm

Page 139 0nward of the 2002 looks helpful

may help,check each wire in turn.

Trailer Wiring I

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!!

Have you checked the bulb and lamp connections with a multimeter?

It could just be bad connections on the spade connectors at the lamp or where the wires are crimped inside the spades

Also if any scotchlocks(blue or red connector blocks) have been used check them first!!

Click to enlarge