Westfalia 321 556 391 101 Instructions De Montage page 28

Socket pin assignment
Pin Circuit
1 Indicator lamp, left-hand side
2 Rear fog lamp
3 Ground (circuit 1-8)
4 Indicator lamp, right-hand side
5 Tail light, right-hand side
6 Stop lamp
7 Tail light, left-hand side
8 Back-up light
9 Constant plus
10 Charging lead
11 Ground (circuit 10)
12 Trailer identification
13 Ground (circuit 9)
Pin assignment of microswitch housing
Pin Wire Colour
1 white/yellow
2 --
3 gray/white
28 321 556 391 101 - 009 - 04/08
Installation instructions:
Electrical system for towing hitch
Wire Colour
black/white
gray/blue
brown
black/green
gray/red
black/red
gray/black
black/blue
red
yellow
brown/white
--
brown
VW Caddy III, Caddy Maxi