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Quote: Originally posted by ofat1 on 21/12/2009

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Thanks JTQU,
I have put a multi meter over all the 12s van connector, cant find a voltage (1st tried pin 4&3 then 2&3), is their an interlock in the system to stop voltage returning to the car?

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Your 12S lead will have a diode or some such electronic component in line with it back to your unit in the caravan to act as a non-return valve (so to speak) to ensure that current can flow into the battery....but not out of it back done the line. This means that you shouldn't be able to read a voltage across the respective pins.

But why bother...I would install an external mains socket on a suitable wall or fence or post and simply use a short hook-up cable instead.....as you would on site. My vans have been hooked up this way on my drive for many years and never had a problem and always fully charged and ready to go....it's also handy for the lawnmower, hedge trimmer etc as well (through an RCB of course).