Hi all, I have a question for the techsperts. My bike is an 01 FXD with only 30k on the clock and I want to know is what would cause my regulator to fail i.e.overcharging?

I don't have specific Harley experience, but I'm an electronics tech by trade.
The very first thing I would be looking at is any loose connections or corrosion.

The basics of fault tracking apply - go for the most likely first, then do more detailed testing if required.
An '01 bike: 10 years old, yes?

In general, if it's over charging, I would be looking for a loose or corroded earth connection or something in the earth circuit - plugs/sockets etc.