Looking at the pictures in your earlier posts, the original unit fitted was a Symphony, and the aerial has an amplifier, fed from pin 5 of the grey ISO connector on a Purple/Yellow cable, which needs to be live when the stereo is switched on.
It will not be anything to do with anything in the boot well, or anything to do with your circled connector in post 9.
Last edited by raykay; 30th January 2019 at 20:24..
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