Second message asking for advice on IT944 control panel

[AndyHereford]

I have a 2007 Burstner Aviano motorhome with an Elektroblok EBL99 transformer / rectifier and an IT944 Control Panel. Over the last couple of weeks the Control Panel has started showing a permanent current "drain" of approximately 9amps (whether or not any appliances are switched on) and it still shows a drain when the van is connected to the mains, although this reduces to almost zero over a few hours. However it never shows a positive charge! Swiching appliances on and off and switching the Elktroblok on and off seems to have no effect on this reading! Has anyone any ideas out there as to what might be causing this issue. The batteries seem to be taking a charge OK when connected to the mains and holding a charge reasonably well when parked up and not on hook up. All the other features on the Control Panel are fine and everything else in the van is working correctly.

The van has two batteries fitted. One could possibly be the original as there is no paperwork indicating what it has ever been replaced. There is also a newer one that was, presumably, put in when a previous owner had an inverter fitted (the inverter is switched off)

Any advice would e greatly appreciated!

[Robbo]

On my German van there are some 12v circuits which are live all the time even with the 12v switched off at the control panel.

 

These are:

A) electric step (which is understandable)

B) fridge control panel (again you may want to run the fridge with the 12v circuits turned off).

 

Suggest you initially remove the relevant fuses one by one from the EBL (with EHU disconnected) and check the current draw across the fuseway with a multimeter set to amps (DC).

 

If that doesn't reveal the leakage, test the other fuseways.

 

Failing that disconnect each leisure battery one at a time. A cell in one of the batteries might be shorting out.

[aandncaravan]

When all the usual things have already been investigated, the cause with this amount of current is often that someone has populated the AES fuse slot so allowing the Fridge to run off the habitation battery, not the usual Alternator source?

Try removing the AES fuse second from left and see if that makes a difference?

 

The AES fuse slot should only be populated when you want to run the Fridge for a very short time from the habitation battery when the engine is not running.

Such as a short ferry crossing or a 3 hour stop at a Motorway services where naked lights are not allowed preventing the Fridge being switched to Gas, etc.