Hi guys, I have a problem getting the reversing lights to operate on the trailer. When the trailer is connected, switching on the rear foglights shows a fault symbol on the dash which clears itself after cancelling the lights and switching the ignition off and on. The foglights do not come on, either on the van or trailer. I have tried a 7 pin and 13 pin plug, its a 13 pin socket.
Its a Sawiko system and canbus operated, the supplier and fitter is no longer in business.
The van is a Fiat Ducato 2.3 base, all else works fine.

Any ideas?????? Cheers John.