Nice one Andy,
The two items I have wired to my home made piggyback are both 12 volt so this time I do not need a volt dropper.
I am filing this for future reference, because I am sure I'll need to build one sooner rather than later.
Thanks for the info.
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)