Hello! Has anyone else had problems with the batteries on the Fiat Ducato 2.3l draining from full charge (with everything switched off) within a few days so that the engine cannot even be started. The Fiat dealers, specialist auto electricians, etc, have all had a go and failed. I have to keep a trickle charger running all the time it is parked up at home to avoid ruining another battery. Anyone had and solved a similar problem?