[Jim Jamieson]

Macafee, use the bypass relay as in post 2 and don’t use scotch locks.

When I wired up my Wedgewood with 13 pin I sourced some tail light wiring from a scrap car to extend the connections for the nearside wiring over to the off side where I had mounted my bypass relay and split charging relays.
All my connections are soldered then taped up.
You need to run two cables from the front of the car fuse box area, one heavy enough to power your fridge and charging, the other as a switching wire for the relays. I used two relays, one for the fridge the other for charging your caravan battery.
Purchase a 13 pin pre wired socket (PF Jones) with sufficient cable length to reach into the wheel arch are just behind the seats. Your less likely to have any damp issues if mounted here.
There’s plenty of info on the forum regarding the cabling from the front of the car.
Good luck.

Forgot to add, you can use the same supply running from the fuse box to power the bypass relays and the split charging relays, just make sure you use cabling heavy enough to carry the load.