If your bike's indicators, horn, and self-ignition are not functioning, while the headlight works fine and dims when slowing down, it is unlikely to be a battery failure. The indicators, horn, and self-ignition are typically powered by a separate circuit from the headlight.
Here are a few possible reasons why those components may not be working:
Fuse: Check the fuse box of your bike. There may be a blown fuse that controls the indicators, horn, and self-ignition. Replace any blown fuses with ones of the same rating.
Wiring Issue: There could be a wiring problem or a loose connection in the circuit that controls the indicators, horn, and self-ignition. Inspect the wiring harness and connections for any visible damage or loose connections. It may require professional assistance to diagnose and fix the issue.
Faulty Switches or Relays: The switches or relays responsible for controlling the indicators, horn, and self-ignition may be faulty. These components can wear out over time and may need to be replaced.
Faulty Components: It's also possible that the indicators, horn, or self-ignition unit itself is faulty. In such cases, these components may need to be replaced.
It's recommended to have a qualified mechanic or an experienced professional inspect your bike to diagnose and fix the specific issue. They will have the necessary tools and expertise to identify the problem accurately and provide the appropriate solution.