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Henry, you don't happen to have a wiring diagram do you? ...
You don't really need a wiring diagram, you'll find the relevant colours on various posts over the years but here goes ...... again
Car ................. lamps ............... 12N socketblack/blue ........rear fogs ............blue
black/white.......left turn ..............yellow
black/green ......right turn ............green
grey/black.........left tail................black
grey/red............right tail..............brown
black/yellow......brake..................red
brown...............earth...................white
be aware though that the brake lights are fed via a 'relay' base for a trailer check control, so your trailer feed need to come from the actual lights or if you use the socket in the back of the boot, you'll need to bridge the base connections to get your trailer lights to work. (above the driver's feet on pre facelift & behind the glove box on facelift cars)
12S socket feeds can easily be found via Google & to a degree depends how old your caravan is as to how it's wired.
