Scenic 1.9DCIi 2004 Battery Discharge

[602cc]

Hello.
My latest vehicle has on 2 occasions refused to start due to a discharged battery, on one occasion down to 7.5v. Jump starting got us going. As the car is new to me took it back to the supplier but they have told me there are no faults. I'm not convinced. I have put a new battery on. In 2 days the voltage has dropped 0.3v, is this drop normal on a modern car with radios, alarms, immobilisers etc?
I'm sure it needs a decent auto electrician, but being a recent purchase I'm reluctant to pay, will probably have to though
Thanks.

[harryp]

Try, battery positive off and check current drain using multimeter - guess should be <50ma, say 20 or so. Second easy one is to remove lead from alternator output lead and check to see if cured- if so may need diode(s) replacing. Aftermarket radio fitting known to be a cause. Otherwise, reconnect battery lead and start removing fuses one by one to ascertain circuit causing problem. A good start would be the Citroen Xantia Forum!! (but then I am biased)