This is the second time I've posted on this, and I'm getting pretty desperate now! Just blown what is the 5th replacement. The symptoms are: Driving along, coupled to 'van, tale-tale (sp) works when indicating left, only to find out from a following outfit later that the indicators not working ? also this time, no n/s tail light. Now just put a live through from caravan plug (new) and both tail light and indicator working. This has been the case throughout since the problem emerged some 2 years ago. Last time the very patient tow bar fitters replaced the relay, they also put in new 7 core wire and new socket, all for free. ( well done Gary at PC Towbars Plymouth) So now where to look for proper remedy? Looking under rear of 'van the 7 core comes out from between back panel and floor, no sign of problem at rear light unit, 7 core all fine right through to plug no joins,no signs of trapping/ chafing along its whole length. Plug is the alloy metal type and I think I'll replace it again as the pins wobble too much for my liking,dont really think this is the cause.Please someone tell me they experienced the same and what was the cause.......Please!