Camper Trailer Wiring

Maybe it is 12 volt auxiliary lights inside the camper powered from the car??

Hi Jamas,

If your van has a battery setup, then it may be an active feed to keep your battery charged while driving.

Cheers
Gerry

Hi Jamas,
Do you have a 3 way fridge in the camper?

check whether the aux (No2 wire) supplies 12V power to the fridge and/or internal/external lights in the camper.

It is a fairly common set-up.

FWIW I have fitted a dash switch to my set-up to allow me to turn the van power off to isolate that wire (No 2) when towing anything other than my van. Prevents electrical problems with non standard wiring on other trailers etc.

Cheers

Disco

Black wire number 2 can be used for but not limited to the following.

Running the fridge in your camper whilst driving (not very effective) as you can't get a whole lot of current to run that far on that thin a wire.

Setting up a reversing/work light on the back of the camper.

It seems as the previous owner has a switch in ine that he was using it for either of these two reasons. I use it to run the fridge whilst driving, I have put a bypass switch in it because tyhe fridge in my Pioneer draws as much as 13 amps which will drain my second battery in about 4-5 hours. If we stop for length of time I flick the switch to protect the battery completly draining. In any case even with the car running and the camper battery on DC the fridge temp will rise 4-5 degrees from the time we leave home until the time we reach our destination. At the moment I put drinks and veggies etc in the camper fridge and anything crtical like milk and meat in the Waeco in the car.

My next step is to run a set of 60amp cables via anderson plugs and a second battery isolator so the car will charge starting battery, then second battery under hood and then third battery in camper.

I assume Coromal use the same setup as Jayco, so as mentioned above, the 12v feed is for the fridge and lighting and on board battery.

There should be a small switch inside the camper which isolates the battery, and if Coromal use the same 240v to 12v power supply as Jayco, be carefull........when connecting the battery, white cable is negative black cable is positive!!!!