I agree with Tango's post as my friend has one originally fitted the very first year they were manufactured, it has now been on 5 caravans and regularly used as he does a lot of rallies and his brushes have not been touched. Click on link for fault finding chart. http://www.arelectronics.co.uk/mvchart.pdf
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.