1. Disconnect electric installation between trailer and towing vehicle.

2. Unscrew the screws on cover of the lamp or pull out cover if it is press in.

3. Change bulb with new bulb with the same characteristics.

4. Give the cover to the lamp, screw in the screws to the cover of lamp (or mount cover back if it is press in) by the same way like during demounting.

5. Then connect electric installation between trailer and towing vehicle and control if lights are working correctly.

In the case of failure of non-replaceable light source (e.g. LED lamp) contact manufacturer of trailer.