Oh boy, between small photos and your rather unusual choice of wire colours its really hard to follow...
TBH I am strongly tempted to suggest you take it apart a bit and rewire it with the colours used a bit more consistently. It will make it a lot easier to follow. Not least if you want to make changes in the future...
But if you have a meter handy or can borrow one - and they are damned cheap these days anyway - what I would start by doing is making sure that the case of every item is connected to the case of every other item, and if you find one that isn't that's certainly a problem.