why does my Ford F-150 battery die when the car is off

Solution

1. Preparation

• Tools Required: Multimeter, wrench set, fuse puller, basic hand tools.
• Disconnect the negative terminal of the battery to ensure safety while working on the electrical system.

2. Clean Battery Connections

• Sub-steps:
  1. Remove the negative and positive battery terminals using a wrench.
  2. Inspect the terminals for corrosion; clean them with a wire brush and a battery terminal cleaner if necessary.
  3. Reconnect the terminals, ensuring they are tight and secure.

3. Repair or Replace Affected Components

• Sub-steps:
  1. If a faulty circuit is identified during the parasitic draw test, repair or replace the circuit or component causing the issue.
  2. If an aftermarket accessory is drawing excessive power, consider removing it or re-routing the connections to avoid battery drain.
  3. For module failures, consult the vehicle's service manual to either reprogram or replace the affected module.

4. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the vehicle and check for any warning lights.
• Test the battery voltage again to ensure it is charging properly.