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 hi mr b.

 i would check the socket,open it up and look at the terminals/wires inside,water/damp does get inside and corrode the fittings in there causing shorts etc.

 if possible change the socket and fit a socket cover when not in use,cleaning all the wire ends and making good connections is a start,checking the cable all the way back to your tail lights and making sure its all ok and not trapped anywhere as well.

Quote: Originally posted by mr_b_ugs on 31/8/2010

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Hmmm... 13-pin plug and socket? What makes a plug and socket with more pins more reliable than the current 7-pin configured plug and socket? I thought there was only one type?

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Quote: Originally posted by Tentz on 01/9/2010

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If you are only towing a trailer its not worth fitting a 13pin. You can probably fix the problem in 10mins If trailer plug connections are definately clean, check if trailer is earthed to its chassis. Look underneath, if you can see a wire screwed to chassis somewhere & its rusty, clean & use new connector & screw.

Still no joy, then you will have to dismantle car socket. This more likely to be your problem as they get full of water. If socket is corroded inside buy a new one including rubber seal that goes behind it. When making connections strip wires back a bit to get clean metal.

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