Repetitive clicking from the starter relay sounds like the voltage is dropping too low. If it starts fine with a car battery, it sounds like your battery may be toast.2017 Strom 650. Volt meter shows 12.68 battery at rest. Headlamps and lights well lit. Upon trying a start all I get is a very rapid clicking and a sorry attempt at the engine cranking over. Replace a battery with 12.68 or is this a starter problem? Can jump off my car battery and runs well until shut down. Battery tender shows full charge. Just 13K miles. Just priced a battery! What happened to pricing!
Any assist much appreciated.
It may be useful to measure your battery voltage when its trying to start, or if you can get it to someone with a proper battery tester (like an auto parts store!)