Blimey emzedder that so on topic... A Close Call. Were your gloves alright?..
Yes Darren it is so boringly repetitive how many times this issue comes up.
The Sie R/R is on the front of the frame, nicely in the airflow. But I think that the problem is started off by a high resistance connection.
I remember fitting an upgrade three phase alternator to some bike or other years ago. The instructions stressed the importance of low resistance connections to the rectifier, and described ways of achieving this. I didn't fully understand the electrical terminology at the time, so I looked it all up.
You need low resistance to make it easy for the current to flow. When it meets resistance it makes heat and causes failures like that pictured above.
Low resistance means a large cross section of conductor throughout the circuit.
High resistance is caused by dirty loose or corroded connections, or connectors that are too thin and have little contact area.. In other words anything that reduces the cross section of the conductor.
Yes indeed all very boring, but I posted this up just to remind folk that even if you know the story and keep an eye on your connections.. Turn your back for a second and it bites your arse.!!