12 volt running - am I missing the obvious?

I'm  not  familiar  with  your m/h  but  my  first  thoughts  would  be  that  the  output  of  the  240 to  12  volt  transformer  unit  may  well  be  switched  off !  If  the  l/battery  was  renewed  a  sensible  engineer  may  well  have  turned  it  off  for  his  own  safety !

On my privious van there was a switch to  switch on the 12V, is there such a switch?

Thank you both for such speedy replies.  ABM, - this could well be feasible so perhaps a trip back to the service agents. Cornersteady, - thank you also.  I have looked high and low for a switch for the 12V but the manual makes no mention of where this may be located.

I assume there is a  leisure battery fitted, as although normally required, I don't think one is always needed for 12 volt appliances such as lights and pumps to work whilst on EHU, as the charger would power them. It would also register a voltage. If a battery is present I would have thought this would register once the EHU was turned off.

Sorry disregard, just noticed the bit about new battery.

Thank you Steve.  Yes, we have had a brand new leisure battery fitted during the recent service.

the electric system may have its own manual? you could try googling the name of the transformer? Our 12V master switch is located next to where the transformer, breakers, fuses are.

One more thing, are the lights 12V lights, or do they look like 240 household lights?

My caravan has a control panel and when I unplug the cable I have to restart the control panel to get the 12v system working. I would call the service agent they may be able to tell you over the phone!  I sorted a few queries that way - much easier too!

Cornersteady, there is a switch on top of the leisure battery casing and this is switched to the on position.  Also, we have both 12 volt and 240 volt lights.

Thank you Pippah - I think, especially since I seem to be quite clueless on the operations, a call to the service agent is necessary in the morning.

thanks for your replies (that doesn't always happen). Sorry I can't be of more help, a call should resolve matters, keep us informed.

The slight puzzle is why you lights work on 230v but as soon as the mains is off the don't work. When connected to the mains the 12v side is usually run via a transformer. However this usually requires a switch to be on somewhere. Are you sure you have a charge going into the battery? Is it possible you have a duff charger? One possible way of testing is the disconnect the mains and run the engine to see it that powers up the lights. You say that you can see the battery voltage when connected to the mains but I assume you can't see that with the mains disconnected? Hopefully there is a simple answer?

David