12 volt from car to deep cycle battery in caravan.

Hello Everyone, Someone with more knowledge of electrics may be able to advise me. I have a deepcycle battery in the van and a solar panel to top it up. My previous x trail was wired to charge the battery in the van whilst travelling. I now have a new 2008 x trail with a 7 point flat plug but am uncertain IF the van battery is being charged by this new vehicle. Is there some simple way of testing it? OR do I have to travel with the van hooked up and then run a voltmeter over the batt terminals to see if its being charged. ( I guess its a fairly simple check for an auto electrician, but thought I might try and save some $$$ thanks everyone johno
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