Westfalia 321 544 300 107 Instructions De Montage page 20

16. Disconnect vehicle-fitted 2-pin black plug connection and connect it with the cable adapter
supplied as follows:
Lock vehicle-fitted 2-pin black socket housing with 2-pin black pin housing from the cable
-
adapter
Lock vehicle-fitted 2-pin black pin housing with 2-pin black socket housing from the cable
-
adapter
Lock vehicle-fitted 2-pin blue socket housing with 2-pin blue pin housing from the cable
-
adapter
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Installation Instructions:
Electrical System for Towing Hitch
VW Golf / Golf Plus