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Faulty trailer lights are not only a nuisance to following traffic but are also downright dangerous. Often the fault lies in the plug/socket connection or the cable fittings to the plug/socket . Any plug/socket which is suspected to be faulty should be renewed. This job is not too difficult even for a beginner but identifing the correct wiring colours and terminals often puts people off this job. Terminals are numbered using standard systems and either one or both systems will be printed around the teminals
system “A” “B” Wire colour Operation
L 1 Yellow Left hand indicator
54g 2 Blue rear fog light
31 3 White Earth
R 4 Green right hand indicator
58r 5 brown right side lights
54 6 red brake lights
58l 7 Black left side lights
Once the wires are connected a coating of battery terminal gel will reduce corrosion on the wire ends and clamping screws, also always fit and tighten any cable grip or gland nut. Other faults common to trailer lights can include, damaged cables, blown bulbs, corroded bulb holders or corroded joint boxes. Disco type faults , eg. indicator goes off when brake is pressed followed by all lights flashing, is most likely to be a problem with the earth connection on either the trailer or towing vehicle. Remember the towing vehicle could be at fault so check for output at the socket using a multimeter or a test lamp.