A picture paints a thousand words. 
So you may well soon have a working boot light, but the GPS problem presumably persists. What connector is on the aerial lead?
I'd obtain a cheap GPS aerial "puck", connect it in place of the OEM one and see what transpires. Just hang it over the side of the car for testing.
When I had to replace the faulty aerial (on my old PF S8 many years ago pre A8parts even?) I placed mine outside at the bottom of the rear screen.
It worked a treat and you wouldn't know it was there unless told (see photo). The wires were routed under the boot lid seal.
With the RNS-C (yes really!) I had on that car wiring it in wasn't that easy, but with your boot-mounted unit it should be pretty simple.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 14th August 2020 at 08:53 AM.
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