Charging Caravan battery with 8 or 12 pin plug?

Hi,
I have just fitted a 12 Pin flat and used 2 of the 30 amp pins (4 in total with negative) for the trailer battery feed. Actually this is how the trailer manufacturer wire the trailer so I have just done the same on the 4WD end. The 12 Pin plugs have 5 pins that are larger for heavier current applications so better choice than the 8 pin.
I used a Britax B48 on the 4WD end.
Can't help you with the isolator in the caravan as we already have the isolator in the 4WD. The camper trailer has a relay that opens when the ignition is turned off so the trailer battery is isolated from the 2nd 4WD battery when stationary.
Cheers
Mark

Mainey ,

Recently read this in answer to your first question - from a sparkie on Myswag --

If you have a 12-pin plug you can double up the terminals to get a better connection if you want. Each of the larger pins are rated to 35A which is more than enough to carry charging current.

I converted my trailer over to 12 pin (got rid of the Anderson) and I would never consider going back.

Cheers

Steve

Mainey check out thread 80061 it might help.

Mainy
If you mount batt isolator on van and have less than 6 b&s cable to the isolator you will find that the isolater would possible pulsate in and out when the batt was flat due to voltage drop in thinner cable. The voltage drop could be up to 3 volt which would cause the isolator switch off voltage setting to operate. Once isolator switchs off the voltage would rise a switch isolator on then voltage drop would then switch off again, then the pulsating would continue.

Murray

Have now sorted out the situation :-)

Thanks for the replies

Maîneÿ . . .