Battery not charging 2003 triumph rs any ideas wear to start to solve problem have replaced battery

sounds like the live for the run switch is not there this feeds the cdi unit and the starter relay trigger

Two things fixed mine first a new battery, the Sprint needs a really good charged battery to start, not just an old charged battery. Even jump starting didn't work for me. Second non ethanol fuel, these engines hate ethanol.

yes seems as a starter problem

Mate not really an answer but my 2002 triumph datytona, has got LED's on the front and i have no problems with them and have you tried Ebay for replacment ones.

I think I would change the petrol in the tank as it may have become a bit stale. Also I would replace the battery.Make certain the replacement battery in fully charged before you try again.

Usually we start with the regulator as it is the less costly and easiest to replace of the two. Additionally replacing the stator and regular in pairs is not a bad idea...unless you happen to purchase a defective one. Sorry don't have better news.


JP

try charging up the battery, the starter needs around 60 amps to turn over compared to the lights that only need around 5 amps, maybe it just doesnt have enough power to turn it over... hope this helps

This is a known issue with Triumph Triples from 2002/2003 - there was a 'feature' in the ECM code called speedo error check which looks at the battery voltage and disables the speedo if below boundaries.
However this feature was extremely problematic from the very outset - even brand new batteries would suffer this issue.
It is exactly as you described - typically at first start it will disable - speedo reads zero; a subsequent re-start will restore. No in between - either works or doesn't work (a reading that is inconsistent to actual speed is more likely to be a speed sender issue).
Triumph received so many complaints that they disbaled the feature in subsequent revisions.
The solution is to have your dealer upload the latest edition of 'tune' for your model into your ECM.
Unfortunately this is not something you can do yourself.
Depending on your relationship with dealer, some will do this free - or charge a nominal fee around $50.

This will 100% fix your problem.