This is usually caused by a breakdown of the reversing lamp. It is fitted to the ACPR body, adjacent to the lock on the back of the back gear, on the side of the left hand. To replace, you need to:
1. Remove the protection of the engine crankcase;
2. Disconnect the connector from the switch
3. Roll it out using a key of 22;
4. Roll out a new trailer.
It is important to make the last two steps as quickly as possible as oil will flow from the circuit breaker.
