why does my Honda CR-V's battery light stay on while driving

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, wrench set, battery terminal cleaner, and safety goggles.
• Ensure the vehicle is parked on a level surface and engine is off. Disconnect the negative battery terminal to prevent electrical shock.

2. Battery Inspection

• Inspect terminals: Clean corroded battery terminals using a battery terminal cleaner.
• Check connections: Ensure that the battery terminals are tight and secure. Reconnect the negative terminal.

3. Alternator Testing

• Measure output: Reconnect the battery and start the engine. Using the multimeter, check the voltage at the battery terminals.
  • If voltage is below 13.7V, the alternator may need replacement.
• Inspect belt: If the alternator output is low, check the alternator belt for wear. If worn, replace it with a new belt.

4. Alternator Replacement (if needed)

• Remove old alternator: Disconnect electrical connections and remove the mounting bolts using the socket set.
• Install new alternator: Position the new alternator and secure it with mounting bolts to the specified torque (typically around 30-50 ft-lbs). Reconnect the electrical connections.

5. Final Check

• Reconnect battery: Reconnect the negative battery terminal.
• Test system: Start the vehicle and monitor the battery light. Ensure that the voltage remains within the normal range.