Bay15d LED issue

[Spot]

Mijuuti, I am glad you found the issue.
The picture at Marinebeam is very good, https://store.marinebeam.com/ba15s-b...141-1142-1156/
Here it is marked up with positive (+), negative (-), and no connection (NC).
The BA-15-D could be inserted 180 degrees to change polarity at the contacts or use a LED that is not sensitive / has internal correction. The rest assume the outer shell with pins are negative (-).