So I know there’s loads of threads in this,Just after connecting up Ctek trickle charger I had, used to use on my xkr, just hooked up the tender and left in the boot, ready to connect to the power, I just went with simple hook up to the battery in the rear, positive to power on battery and negative to a bolt in the body that was holding on a bracket, as per pictures , I have seen the pictures of how to fit but my 2018 4 pot seems to be different, do you think I have it wired,

The last picture is the regular fitting picture then mine as you can see is different, I’ve wired showing yellow arrows

 

I've seen people who've connected the positive to the yellow wire on the busbar (your un-arrowed picture).