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Quote: Originally posted by G,Winger on 14/3/2018

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this fault is almost certainly due to a poor earth return from your trailer bulbs back to the cars socket.
take all bulbs out and clean the holders and the bulb earth also remove any connecting wires earth and clean these up ,work your way through to the plug on the trailer, check all connections, clean them up and lightly grease with di-electric grease.
earth return wire is usually coloured white.
stu

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Quote: Originally posted by daveyjp on 15/3/2018

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It sounds like a faulty connection on the board and the circuit isn't completing.

Trailer boards, caravan lights etc are prone to issues due to water ingress, condensation etc.

As you probably won't have any grease to hand, as a quick fix use a cotton bud to smear brown sauce on the connector plug and test the lights again.

It sounds mad, but the vinegar cleans terminals and improves conductivity.

Following that you need to strip down as much as you can. Remove lenses, take out bulbs and look for any corrosion on the terminals, bulbs and connecting cables, screws etc

If you notice any it needs cleaning off, if it is very bad you may need new components.

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