what does it mean if my Ford F-150 12th Generation (2009-2014) has a B1235 code

Solution

1. Preparation

• Gather necessary tools: multimeter, socket set, battery terminal cleaner, load tester.
• Ensure the vehicle is parked on a level surface with the engine off and keys removed.

2. Inspect and Clean Battery Terminals

• Sub-steps:
  1. Disconnect the negative battery terminal first, followed by the positive terminal.
  2. Clean the battery terminals and cable ends with a battery terminal cleaner to remove corrosion.
  3. Reconnect the positive terminal first, then the negative terminal.

3. Test and Replace Battery (if necessary)

• Sub-steps:
  1. If the battery voltage is low (below 12.6V), charge the battery using a battery charger.
  2. If the battery fails the load test, replace it with a new, compatible battery.
  3. Dispose of the old battery according to local regulations.

4. Inspect and Test Alternator

• Sub-steps:
  1. Check the alternator belt for wear and proper tension; replace if needed.
  2. Start the engine and use the multimeter to measure voltage at the battery terminals; it should read between 13.5V and 14.5V.
  3. If the voltage is low, replace the alternator.