As @CROSSBOLT would say, "oldy moldy story" of this XC 500.
This scoot (if 500i model) needs a very healthy battery to get alive. A weak or demaged batt will not fire your scoot up.
(pls see link)
https://www.kymcoforum.com/index.php?topic=33615.0I changed from lead battery to LiFePo4 batteries on all my scoots and bikes, no probs since then to make them run.
Should this battery be a new, healthy one, then
- check whether enough voltage is put out from your regulator before you get to your stator
Proc: start motor, check with a multimeter voltage arriving at your battery at 4000 rpm (~14+VDC)
-less than that indicates a faulty regulator on most cases...
Pls check this and come back for more.