Out on a ride and noticed poor midrange when overtaking, about 20 miles from home and display went completely blank, engine management light came on. Managed to limp about 15 miles with no power then died, 30 amp fuses kept on blowing without ignition on RAC puzzled, trailered home. Checked battery 10v output only but brand new heavy (Lucas) duty, recharged and bike started fine in garage but no charge volts to battery 12.5v no load, engine running 11.8v no increase with revs
When there is no charging system operational, the bike will run wih battery in total loss mode. When it gets to a certain point of discharge, the first indication is indeed as you saw, the intruments go blank. There is little power left at this point and need to get home asap!
Either the R/R (rectifier/regulator) and/or the stator is bad - both are unfortunately quite common failures on these bikes.
You can find a diagnosis guide that I personally authored at this site:
http://www.triumphrat.net/speed-triple-forum/104504-charging-system-diagnostics-rectifier-regulator-upgrade.html
Follow those guidelines and you will be able to determine which or both is failed.
Also is a recommendation for a retrofit/upgrade to a better component if you do need to replace the R/R.
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