Leisure batteries drop to dangerously low when van left for a week

[Langloan]

Fiat Ducato Autotrail Arapaho

i am getting the batteries checked again tomorrow but the last time checked in the late summer they were fine

What power can be pulling on them - the only thing that i can think of is the Sigma alarm or maybe the media centre in the van?

 

[Lenny HB]

The alarm will be wired to the starter battery.
When you say you are getting them checked it is a waste of time getting them checked by a battery supplier or a car workshop. They will do a CCA test which is meaningless for a leisure battery. The only way to test them is by doing a slow discharge test.

 

[68c]

Do you have a posh habitation control panel with display screen and lights? Some Truma water heaters have a permanently live solenoid holding the hot water tank drain valve closed. Your TV aerial may have an amplifier, again live unless you switch it off, the same fir TV on standby. The fridge control panel may drain power. Can you switch off all 12v supply? Not usual to connect alarm to leisure battery.

 

[Kannon Fodda]

Other post shows you have an inverter added. Is that fully off, not just in standby? Standby or eco will still have some current draw.

 

[TinaLes]

Charge Leisure batteries up, check voltage to see how charged they are 80/90/100%, then turn battery isolator switch off and check again after a week. That will tell you if you have items draining the battery, then you can start to locate them.
LES

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[Tombola]

Get a multi meter and put it across the fuse terminals one by one...after the van has been switched off for an hour or so to see what one is taking the biggest draw.