' I'm just missing something.'
As long as you can keep looking at it like that you will eventually find the problem. Questioning of yourself is the most important tool in your toolbox yet most have never seen that tool.
I have never paid ever for a car or bike repair and I now can fix electronic cars as well as electronically controlled automatic transmissions and with zero formal training in any of it. It comes from reading, thinking, and always suspecting your possible self error or simple lack of knowledge in whatever you are working on. The people who assemble this stuff are absolutely no smarter than you and that makes it then a matter of you getting the lacking skills. I have always been able to find the source of all troubles; sometimes it takes a while but I made up my mind NOT to throw parts at at things like when I was in car parts I saw so many people do to waste thousands of dollars. Careful thinking is worth spending time on as it makes $$$$$$$$$ come out of thin air but it seems to be a lost art, everybody is in too much of a hurry now and the problem.
I most certainly mean no disrespect at anybody posting this stuff but the air needs to be cleared of the bullsh-t from time to time. Doing electrical over the net is one of the harder things to do once it goes beyond one or two wires.
FYI, in my younger days I had an AMC Hornet, a pretty rare one with the 360 inch V8 in it. The car had an issue to where it would suddenly run a new battery down to then not do it again for a month or so. I chased that issue for several months in bits and pieces and finally it p-ssed me off enough I literally started at the front and went through entire wiring harness, and during that time began training myself on power leak detection by yanking fuses to see which major circuit is leaking power at rest. I traced the issue to the new-at-the-time seat belt detection module, which had some kind of a power short inside that did not leak at all times, only when it wanted to. I yanked the module and rewired around it to make car start again and the problem disappeared forever.
Sometimes it takes a while depending on where your head is that day and how receptive it is to thinking out of the box that day.