my Toyota RAV4 battery drains overnight what should I check

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal before starting any work.

2. Clean Battery Terminals

• Remove the battery terminals using a wrench.
• Clean the terminals and cable ends with a battery cleaning brush or baking soda solution to remove corrosion.
• Reattach the terminals securely.

3. Replace Battery (if necessary)

• If the battery is found to be faulty (voltage below 12.4 volts and unable to hold a charge):
  • Disconnect the negative terminal first, then the positive terminal.
  • Remove any brackets or hold-downs securing the battery.
  • Install the new battery by placing it in the tray, securing with brackets, and connecting the positive terminal first, followed by the negative terminal.

4. Repair or Replace Faulty Components

• If a specific circuit is identified with excessive draw:
  • Repair any damaged wiring or connectors.
  • Replace any faulty components or fuses as needed.

5. Recheck Charging System

• After repairs, ensure the alternator is functioning correctly by:
  • Starting the engine and measuring the voltage at the battery; it should be between 13.8 to 14.5 volts.