Horn Works, Headlight Doesn't

Step 2 of 4
"Horn beeps fine but the headlight is dead? Power's flowing, but not everywhere."

Selective Power Flow

Some parts are on different fuse lines. If one fuse is blown or a connector is loose, one system may fail independently.

Your motorcycle's electrical system is divided into separate circuits, each protected by its own fuse. This design prevents a failure in one system from affecting the entire bike.

Motorcycle Fuse Box Diagram

🎙️ Listen to Explanation

🛠️ Diagnostic Steps:

  1. Check if headlight fuse is blown
  2. Wiggle headlight connector
  3. Confirm switch continuity

In this lesson, you'll learn:

  • How to diagnose partial electrical failures
  • How to identify which fuse controls which component
  • The importance of checking fuses first
  • How to test switch and connector integrity

🧩 Partial Failure Diagnostic Simulation

Test the horn and headlight, then diagnose and fix the headlight issue.

📢
Horn
WORKING
💡
Headlight
NOT WORKING
Horn Fuse:OK
Headlight Fuse:BLOWN
Headlight Switch:WORKING

The horn works because it's on a different fuse circuit. The headlight fuse is blown and needs replacement.

❓ Quiz

If horn works but headlight doesn't, it likely means: