When selecting replacement vehicle and trailer lights, check the operating voltage, connector type, mounting position and required lighting functions. Measurements and wiring configurations can differ between similar-looking lamps, so confirm compatibility before replacing an individual light or fitting a complete trailer lighting board.
Intermittent trailer lighting is often caused by damaged wiring, corroded plugs or sockets, poor earth connections and moisture entering a lamp. Inspect the cable and connections before replacing bulbs or light units, then test the indicators, brake lights, tail lights and reflectors before travelling.