If you are just tapping into the 12v power lie I cant see how it would cause any problems. That said are there no other lines you could take power from ?
Currently using the 12v socket but thought I could free it up by using the diagnostic socket although I would need a switched connection as I think the socket has continuous power.
You must connect it via the fuse box with a new fused connection, you can piggyback on an existing fuse depending on whether you require a constant or switched supply. See page 194/5 of the handbook.
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