Cormal van

Yes a transformer or switchmode power supply/charger would be used. Make sure it has240 being supplied to it. The safety circuit or main switch may be off.

If no one can solve the problem here, there are a lot of arm chair experts on caravan forums who love a good debate about what the problem might be

Any chance of you getting some pics of what you have? Will make it so much easier for others to help you then. Even if you can't post them up here yourself, maybe you can get someone's email address from here that can and they can post them up.

If what you have is really a transformer, it will not charge a battery. The output of a transformer is AC power. You need DC power to charge a battery.

We need to know exactly what you have. Look for any makers information. Look for things like the makers name and model numbers. Look got output voltages and currents

Hi,
My Coromal Seka 505 uses 240 volts when connected to power, it also has a battery charger to charge the battery.
The charger on mine is under one of the seats, not near the battery and connected by wiring.
If your battery in the van is receiving charge but not accepting the charge you may either have a dud battery or an older style charger that will need some charge in the battery before it will take the charge.
I'm taking it that when you say transformer you are referring to a charger.
William

My Coromal has a bank of 12 volt fuses in one of the over head cupboards near the door.
I would be checking these.
William