Remove seats, under riders seat you see two connectors, the one you want ends in a blank, see picture.
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Unclip that from its holder by pushing down and towards the rear of the bike.
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Here you can see how it is secured. Now you can remove the blank cover exposing the actual connector, bingo!
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Three wires here; red is live, black is earth.
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With ignition on; provides 12v switched & fused live.
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And with ignition off.
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I just need to find a matching connector - anyone know where I can find one? Is it a standard Harley item?
Hope this helps and was pleased I didn't have to go looking under the fuel tank.