Ignition powered 12volt. Supply

[Cliff Brant]

Hiya,can anyone tell me where I can locate an ignition powered 12volt supply wire near to the rear of the vehicle as I need to upgrade my electric supply from a 6 wire to a 13wire connection to my caravan for the operation of the fridge and battery charger whilst travelling, many thanks Cliff 

[Vauxhall Owners Club]

Can't think of anything that would do the job apart from running a cable from further up the vehicle to the rear?

[Cliff Brant]

Thanks anyway