13 pin and 7 pin Electrics Difference 

I guessed that 13 pin connectors would have..... 13 pins.

My vehicle has the 7-pin (only) socket fitted, due to the fact that it is only wired to supply minimum trailer light requirements. I understand that if you wanted the additional wiring to supply the socket with Live Power to run fridge/leisure battery charging etc., then the 13-pin socket would be required. I know there is a 7-pin (only) plug to fit into the 7-pin (only) socket, as well as a 7-pin (only) plug configured in the 13-pin layout to fit into the 13-pin layout socket. What I cant understand is why there isn't a 7-pin (only) socket configured in the 13-pin layout, so that you could visibly see that the socket is only capable of supplying basic trailer lights, but could still plug in the 13-pin plug, but not have the addition electrical feeds, but at least you wouldn't need to be buggering about with adaptors etc. Just another way of getting you to spend more money eh? Or is there another stupid configuration inside the adaptor that switches pin feeds? I bet there is. Standardisation? Nope!

I can count pins. Must people want to know which to use when.....

if i connect via adapter 7pin to 13pin, where i can take power feed for fridge and constant+ on vivaro 2010

I assume you need 13 pin electrics on your tow vehicle if you are towing a caravan ?

So what about 7s and 7n?