why is my Honda Accord 10th Generation (2018-2022) battery overcharging in hot weather

Solution

1. Preparation

• Gather Tools and Materials: Assemble the necessary tools including a multimeter, OBD-II scanner, wrenches, and safety gear (gloves, goggles).
• Safety Precautions: Disconnect the battery negative terminal before starting any repairs to avoid electrical shocks.

2. Inspect and Clean Battery Connections

• Remove the battery terminals using a wrench.
• Clean the terminals and cable ends with a wire brush to remove any corrosion.
• Reattach the terminals securely, ensuring a good connection.

3. Replace Voltage Regulator (if faulty)

• Access the Alternator: Remove components blocking access to the alternator (e.g., air intake duct).
• Disconnect Wiring: Unplug the electrical connections from the voltage regulator.
• Remove Voltage Regulator: Unscrew and remove the faulty voltage regulator from the alternator.
• Install New Voltage Regulator: Position the new regulator and secure it with screws. Reconnect the wiring properly.

4. Test Alternator

• Reconnect the battery terminals.
• Start the engine and measure the output voltage from the alternator using a multimeter. Ensure it is within specifications (13.7-14.7 volts).
• If the output is still excessive, consider replacing the alternator.