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· Old as Dirt!
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Looks like the remains of a very old style Perko power plug:



Is there still any wiring to it?
 

· Senior Member
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Looks to me more like something you might turn with a screwdriver rather than an electrical plug/connector.. . I think you need to get a look at the back of it.
 

· Master Mariner
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It looks to me to be a high amp, 12 volt power point. It has 2 notches in the socket (probably different sizes to orient polarity) and threads around the socket to screw in the male plug. Have you checked to see if it has power to it? As suggested, if it's near the helm, it was most likely the power connection for a wheel pilot, so look for a breaker on your panel.
I've never seen one exactly like that, but it might be nice to replace it with a new one to power a cockpit light or computer converter, etc.
 

· 69' Coronado 25
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It looks like the Perko plug with the inside (pins socket) gone. Just the contacts are there.
 

· Registered
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its on the transom of my tartan 30 Did not look to see if its wired to anything
It is a old type 12 volt power socket.
They normally came with a screw on lid and a plug with two contacts at the bottom.
The plug can only be inserted on way because the plug has got an alignment pin at the side matching a groove inside the socket.

I replaced a similar socket from 1978 this summer..
 

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Definitely is a power plug ... those spade connections on the inside view are the 'giveaway'.

If the PO had a wind vane, he may have used a small electro-mechanical tiller-pilot to help control and 'assist' the wind vane in very 'light' wind conditions.
 
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