In a Royal Enfield Classic 350 motorcycle, the ammeter is a device used to measure the current flowing through the electrical system. Typically, an ammeter needle staying on the left side (zero or negative side) indicates that no current is flowing through the system.
When the engine is not running, there is no power being generated by the alternator or generator. Therefore, the battery becomes the primary source of electrical power for the motorcycle. In this state, the ammeter needle may stay on the left side as there is no current being drawn from or supplied to the battery.
Once you start the engine, the alternator or generator begins generating electricity. At this point, the ammeter needle should move towards the right side, indicating that current is flowing into the battery and powering the motorcycle's electrical system.
It's worth noting that while some motorcycles have an ammeter, others may have a more modern instrument panel with an indicator for battery charge or other relevant information. If you're unsure about the functionality of your motorcycle's ammeter or any other electrical system behavior, consulting the owner's manual or reaching out to a Royal Enfield service center would be helpful.