Can anybody tell me, does the charger switch on my psu need to be on when the engine is running for the batteries to be charged.On my control panel lights for both leisure and vehicle batteries flash regardless of the switch being on/off when the engine is running.The unit is a Sargent EC400 series combined mains and 12v. I have read the manual but cant seem to take it in:Blush: I also typed this all once before and didnt insert a title and wondered where my post had gone Dave.