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Hello

The rear foglight on my van is on constantly . Is it the van or the car? Just had a new tow bar fitted

looks like a fault on no2 of your 12N plug wiring

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!!

Relay wiring diagrams

Towed the van to a site and the lights were fine . Hitched up to come home and the foglight came on . I ended up taking the bulb out!