I have read all the posts regarding this but I have a conflict of opinion. We are off to France and beyond hopefully very very soon now. I am just about to order a Euro EHU adaptor but I still dont know if I need a reverse polarity tester and lead. We have a Swift Kontiki and the chaps that service it recently fitted a new power supply and have been auto electricians for 30 years. They told me you dont need it as it wont make a difference. Is this something to do with my van in particular then as the posts on here would say otherwise. I trust these chaps completely and they certainly know there stuff. Do I need an adaptor to reverse polarity and a tester or not? Very confusing! From what I understand you get a 2 pin continental plug and a 3 pin socket for your hookup cable to go into. You wire the live from the 2 pin to the neutral on the socket and vise versa. Is this correct? to test on site you put the reverse polarity tester in your MH socket plug it in and if its reversed you add the adaptor you made and if its not earthed you unplug it and run away. Is that right.