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Hi Alex,
I have two 2m 12volt leads ( different brands ) with male cigarette plugs on one end and a small female socket on the other end which plugs into the mount
I pulled apart the male plug on both leads and yes the centre spring loaded pin is positive as it has the inline glass fuse and the wire is colour coded red (+)
Negative is the outside of the plug on opposite sides
General rule of thumb - Centre positive on all extra low voltage plugs and connectors
Martin
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