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pryally
Triumph charging systems can be suspect - probably regulator/rectifier but check the condition of your generator - usually just under a cover at the base and left of your engine - if the copper windings are blackened you'll need to check it's viability but its probably toast. Likely this is OK though and you'll just need to replace your reg/reg. Get a MOSFET one from people like Electrex or https://www.triumphparts.co.uk/. When fitted recheck - you should be getting a healthy 13 plus at least on tickover.