I have a tow bar and a seven pin plug to operate the lights, fitted on my car. I recently took my boat for repair and when they brought it out of the workshop they dropped it from a forklift truck several inches onto the tow bar. When I plugged the trailer lights in nothing worked. I checked the socket on the back of the car and it was completely dead. On the way home I called on a friend and plugged the boat trailer into his car and everything worked fine. So I knew it was a problem with the car.
A few days later I fitted a new socket on the back of the car, tested it with a multimeter and everything was showing 12 volts when switched on. When I plugged my caravan in none of the lights worked on the caravan but everything worked on the car. I unplugged the caravan from the car and tested the socket on the car and it was completely dead. After a few minutes without doing anything but scratch my head I tested it again with the multimeter and found power had been restored. So I plugged the caravan back in and none of the lights on it worked. So unplugged it tested the socket on the car... dead. A few minutes later power was restored.
Can anybody help me with this situation?