How do you shut off alarm after changing battery on 2004 Ford F150 pickup?

To shut off the alarm after changing the battery on a 2004 Ford F150, you typically need to unlock the driver's door using the key or the remote. If the alarm is still active, insert the key into the ignition and turn it to the "On" position without starting the engine. This should disable the alarm system. If that doesn't work, you can also try disconnecting the battery again for a few minutes and reconnecting it.