I have just bought a camper converted T5.1 2013 via private sale which has been fitted with a Westfalia detachable tow bar and Westfalia 13pin electrics (Product #321 454 300 143)

As I intend to use it to tow my caravan I have this evening plug the caravan into the T5 only to find the lights etc do not work. The caravan is fitted with the ALKO ATC system which received power and turned on, there was no charging of the caravan battery occurring nor was there any power to the fridge in the caravan. None of the road lights worked on the caravan (side lights, brake lights, indicators) except the fog lights on the caravan were on constantly.

I know the caravan is working fine as when I connect it to my other tow car everything works as it should.

Can anyone shed any light on what maybe going on with the electrics?

Thanks