I'd go for Dri-Plugs. They are push fit and much easier to use than the Buccaneer screw type. They do lots of different combinations (e.g. for VHF, Multi-connections etc) and mine have given perfect service for 21 years now - pretty good I reckon. /forums/images/graemlins/smile.gif /forums/images/graemlins/smile.gif
Unless you want to be able to disconnect this join, I would not consider a plug and socket type connection. I would solder in an extra length of wire, covering each conductor with adhesive-lined heatshrink and another heatshrink over the whole lot. This is much neater and much less likely to fail.
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<font color="blue"> Where can I buy waterproof 12v connectors please?
I need to remount the rear nav light which will involve extending the cable and I want a good waterproof connection above deck.
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I really don't like "waterproof" connectors. They always seem to corrode (if not when the connection is made then if they are disconnected for any time. Also water frequently gets in via the back of the connector and corrodes the wires inside.
Rather than that I would go for deck glands - if necessary with a connector just under the deck - it seems a vastly more reliable system to me.