The charger (on every caravan I've seen /heard of)is also your 12v system. So, yes, safe to run your 12v system by itself. But, the battery does act as a stabiliser, so I'd leave it on, for the time being. Time will come, though, when the battery might drag the charger down, so I'd replace it as soon as you are able....but no panic.
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2003 V70 2.4SE Auto. Gone now.
2003 XC90 D5. Auto.
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