Hi, i'm typing this as hubby is laid in bath! He says:
All Alteas should have a battery fitted as standard as all lights, heater and water pump are run off the 12 v supply.
Sorry he doesn't know about the on-board water tank but our 2005 model doesn't have one.
Battery - as above the battery supplies lights, heater and water pump but not fridge. That will only run on 240v, car or gas. Caravan doesn't know if its gone over to battery.
Grey plug will charge the on-board battery. If there is a battery charger unit fitted (ours has one in the back of the wardrobe, we think fitted as an extra) then obviously it will charge the battery but if it hasn't got a battery charger fitted then it won't. Also don't forget to switch this unit on, as we did, and ran down the battery!)
Water pump - hubby assumes this is a retro fit as ours is in the r/h side of the front locker. This would make sense if it did ,at some point, have an on-board tank. Was the marks from supposed tank in the r/h side bench as we have seen one on a Unica model.
Shower does run from the tiny 5 ltr water heater, but we don't use ours. Also hubby has heard the pump may need uprating to get a decent flow rate.
If you want to discuss further, off forum, hubby's email adress is nigel hollingworth at hotmail dot com (no spaces) and he will try to help.
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