Not absolutely essential, but advisable. The socket is on the sidelight circuit which is fused at 10A. If you don't fit a correctly rated inline fuse then should whatever you plug into the socket develop a fault then you'll lose your tail light and indicators as well if you just rely on the bike's fuse. Fitting an inline fuse <10A will keep everything else running if such a fault should occur. Generally if running sat nav or a pair of heated gloves a 3.5A-5A fuse will do the job. Check the power/current rating of your accessories. You cannot realistically draw more than 7.5A off this connection or the fuse will blow due to the sidelights, indicators etc taking up the rest of the 10A.

The connector is pretty much impossible to find. You can either chop it off and put a more commonly available one on in it's place, use spade terminals or solder the wires in place.

Be aware that the spare connector is also live when the key is turned to the 'P' position and removed from the ignition barrel.

Unfortunately not.

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