Congrats also from me on your perseverance to find the issue- I think mine had similar but was the wire to the speedo where it goes through the headlight shell. Being an afterthought running LED's is just thin wire poked through and didn't have a fuse on, but now does....
My wiring is out of ordinary due to bits stuck anywhere, so I have a fuse on each circuit as well as a main one at the battery, so if one pops I know which to look at, but they are various ratings (7.5A - 15A) depending on the load (or what I had at hand- working on that).
I'm still sussing my positive ammeter reading, suspecting the meter or battery, but if it persists and I need ideas will probably find/start a different thread