Wire van fridge for 12v

[car10002]

Hi everyone

Asking here because it’s about more than one area.

Got a ba fairmont ghia with reversing sensors and was wondering how you’d disable them when trailer or vans on, there’s a 7 pin flat and a 12 pin flat that has the cutout switch for the sensors but don’t think there’s a 7 pin round with that cut out switch.

With wiring the vans fridge on 12v they usually have another circuit just to power the fridge only and another one through the battery isolator to charge up the house battery through a grey anderson plug.

The van fridge years and years back they just ran the power through pin 2 on trailer plug but now days it’s not rated heavy enough so they usually have power through a second anderson plug (usually black or a different colour to the charging one) so you can’t plug it in wrong plugs, or they use the heavier pins in a 12 pin flat trailer plug to power the fridge and the grey anderson plug to charge batteries.

What would you’s go with if you got a car with reverse sensor or you want to be able to switch between cars camera and vans camera when you plug the trailer plug in.

What’s the maximum size wire that fits in the normal pins and the heavier pins on the 12 pin trailer plug.

Can you buy things that you crimp a wire onto like a battery lug that has a pin that you insert into a pin on trailer plug like a wire that you insert and screw down and ifso what sizes can you get. Something like this https://goo.gl/images/mvA6Sm but goes on a trailer wire or 8 b&s wire for fridge.

Thanks for any help