The universal-fit trailer wiring harness that you referenced, part # 119179KIT from TowReady, is indeed a correct fit for your 2012 Volkswagen Golf Wagon. This kit includes the circuit tester required to positively identify the lighting function carried on each vehicle wire to enable you to make the correct connections.
Most of the wiring splices will be made at the tail light assemblies with one more required for the 12V power feed for the harness wire that runs to the battery's positive... view full answer...
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