I am trying to find a breakers yard for caravans. I inadvertantly connected my battery up wrongly and have ruined my (KT9B0) battery unit in the van. It tells me my battery is always topped up even when it is flat. I have tried to buy new but find due to the age of the van the part is obsolete,so I am hoping to get one from a scrapped van. If anyone can help I would be grateful as the rest of the van is fine and I do not want to part with it yet.