my Toyota Corolla E140 (2006-2013) battery keeps dying what should I check

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, load tester, wrench set, and cleaning supplies.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the area is well-ventilated and free of flammable materials.

2. Inspect and Clean Battery Connections

• Remove the battery terminals (negative first, then positive).
• Clean any corrosion from the terminals and battery posts using a mixture of baking soda and water.
• Dry the terminals and ensure they are free of moisture.
• Reconnect the terminals, starting with the positive terminal first and then the negative.

3. Test and Replace Battery (if necessary)

• Tools Required: Load tester.
• Connect the load tester to the battery and follow the manufacturer's instructions.
• If the battery fails the load test, remove it and replace it with a new, compatible battery.
• Ensure the new battery is securely mounted and terminals are tightened.

4. Check and Repair Alternator

• Tools Required: Wrench set, multimeter.
• Start the engine and measure the voltage at the battery terminals; it should read between 13.7 to 14.7 volts.
• If the voltage is low, inspect the alternator belt for wear or looseness and adjust/tighten if necessary.
• If the alternator is faulty, replace it following the manufacturer’s guidelines.

5. Address Parasitic Draw

• Tools Required: Multimeter.
• With the vehicle off, measure the current draw by connecting the multimeter in series with the negative battery cable.
• Identify any circuits drawing excessive current (more than 50 milliamps) and check for faulty components, such as lights or modules that may not be turning off.
• Repair or replace any components identified as problematic.