disco1942 replied:

If you wish to run your fridge through the trailer plug (and it is the 7 pin flat variety) replace it with the 12 pin one. The extra 5 pins are rated at 30-35 A. If you have other trailers with 7 pin flat plugs they will fit into the 12 pin socket - the sockets are designed to accommodate the smaller plugs.

If you are using the small 7 pin round plugs you will have to change your system for connectors with larger pins - or add a second socket if you do not wish to have to change other trailer plugs. I would keep the fridge system separate from the Anderson system as I like to control the fridge feed from the ignition switch with a relay - saves a lot of flat batteries after forgetting to switch off the fridge when stationary.

PeterD

Geoff (Newcastle, NSW) replied:

I think you'll find if you pull the trailer fuse that none of your trailer lights will work. At least if you have the genuine Toyota trailer wiring harness fitted.

The 100 Series have a grey plug up under the back that the genuine trailer wiring harness connects into. Then all you do is add that 30 Amp fuse and away go all your trailer lights. (The 70 Series have the plug but none of the rest of the electricals to support it, the 70's require you splice in the trailer harness)

It has nothing to do with supplying 12 volt accessory power to your trailer.

Hope that helps,
Geoff

Go-N-Grey (WA) replied:

Thanks, I have the genuine towbar and harness, and I did find the grey plug you refer to when I fitted the electric brake controller. The trailer plug was also prewired for the electric brake connection complete with blue tinned connection neatly taped to the rest of the harness. That is what I call attention to detail.

Looks like further work to get the fridge going, I have the Anderson plug wired through a relay as I was intending to install an Arid Twin charge in the van, and it comes with a relay and relevant protection diodes.

I guess it is good to know the trailer lights are fused through the main fuse box, and not from the individual light circuits in the LC. I would never have looked there, and certainly know about trailers blowing fuses on the car lighting circuits when towing boats.

The van is fitted with one of the big round 7 pin plugs and I am using an adapter to get it down to the small 7 pin connector on the LC. Here hoping the big connector on the van IS wired separately for the fridge, if so will save a lot of work.