why does my Toyota RAV4 XA50 (2019-2024) have a low battery after a short drive

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is off.
• Disconnect the battery using a wrench.

2. Battery Inspection and Testing

• Check Battery Voltage:
  • Reconnect the multimeter leads to the battery terminals.
  • A healthy battery should read between 12.4V and 12.7V.
• Load Test the Battery:
  • Use a battery load tester to apply a load; the voltage should remain above 9.6V for a healthy battery.

3. Alternator Testing

• Inspect Alternator Output:
  • Start the engine and measure the voltage at the battery terminals. It should read between 13.8V and 14.5V.
  • If the voltage is below this range, the alternator may need replacement.

4. Repair or Replace Components

• Battery Replacement:
  • If the battery is faulty, remove it and replace it with a new one, ensuring it matches the specifications.
• Alternator Replacement:
  • If the alternator is faulty, disconnect the battery again, remove the serpentine belt, and unbolt the alternator. Install the new alternator and reconnect the belt.

5. Reconnect Everything

• Reconnect the battery terminals, ensuring they are tight and free of corrosion.
• Start the vehicle and check for any warning lights.