many thanks for your thoughts on my problem, I have had battery off for a good charge, it went down to half amp and showing 13 volts 24hrs later before I refitted it. I need to get to garage so they can test it properly but cant drive with screen misting in cold weather so will have to wait. by the way, both front seats heat up and move as they should and alternator is pumping over 15 volts. thanks again.