Since I destroyed two good batteries, and once I also almost got stuck on the road, and since I learned how simple the test is, then also yesterday when the motorcycle was ready to go down the road I did this test. When the engine is at idle RPM, you should measure at least 13.2V on the battery terminals. This time I measured 12.8V and saw while measuring that the voltage continues to drop (ie there is a charging problem).
Only this year I changed coils, so the first desire is to ignore the problem, start the bike, and then discover that there is a problem after the amount of damage is already really great.
When there is a charging problem, the next step is to check the AC voltage on the coils. I measured through the connector of the regulator, and found that one phase was disconnected. I went one more step back and found that the stator connector was burnt bad.
I exposed the coil wires in a lower place to try to prevent a short, I checked that there was no short, I started the engine and it turned out that probably the coils were not damaged. And in any case I will open and show the coils for close inspection, because I now have to replace the three black wires and the connector.
On the side of the wire harness, it seems to me that the heat did not cause damage to the harness, but there I will do one more close inspection.
And now let the pictures speak for themselves: