I’vereplaced the battery but the problem still persists, does this indicate reg/rectrouble and replacement? If so, whatmake do you guys recommend? I don’t want to go down the OEM Honda path.
If I were a gambling man I’d wager one of the filaments in the stop/tail light bulb has broken and is shorting against the other. Fairly common problem with dual filament bulbs, in your case causing side lights to operate with brake lights and/or visa versa.
For everything else there’s Scorch or, as posted on your other thread, there’s The Triumph RAT forum, its not Triumph specific and talks you through charging system diagnostics step by step