When I apply my brakes the caravan's side lights come on?--I connected the car to my neighbour's trailer board and all was as it should be, so the fault must be on the van's lighting system. Anybody experienced this problem?
I should have said "single earth wire", usually white.Hello Rob. The rear light assembly has a single wire connected to the carcass of the lamp. All the bulbs on that side are connected to this wire.If this wire becomes detached or is of poor connection, then the lamps will try to earth through the feed wire of an adjacent lamp...hence you could have two different lamps illuminated at the same time(both dim). In other words: high resistance contact or "bad earth.Common fault.