how do I connect the 12v plug?

Hi Wayne , The two wires you speak of do they run a three way fridge at all ??? or are they just lighting ??? Just check first what it runs . If its just for lighting your seven pin will handle it . You will have a earth wire (white and a acc slot in the plug ) The trick is if you have a battery charger work out which is positive and negitive on the van 12volt wires . I have a older viscount (85) i have replaced all lights with LED lights . they use a quarter or the power of old lights . I myself would not run a three way fridge off car battery if your stopped . They draw stupid amount of amps and you will find yourself stuck . And they do run better on gas anyway . Good luck with it . Cheers Rob

I would take it to a good auto electrician... might save you a lot of heartache.

If you don't have an understanding for it don't try to do it yourself.

Sounds like you have an anderson plug on your van. Google it and you'll find some information on them, but there is no standard way to hook them up, so really need to understand how it is hooked up inside your van. Lots of variables like fridges and batteries to give you an easy answer. Unless you have time to ask lots of questions and pull things apart yourself, you need to find someone with auto elec experience and get them to help or pay for an auto elec to look at your van.