What does the location of key if you turn it all the way back past off position.

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! Your F-150’s ignition switch has a "Accessory" (ACC) position, which is one click back from "Off." In this position, the electrical systems (like the radio) can run without the engine on. If your key is turned too far back into ACC and left there, it’ll slowly drain the battery—sounds like what might be happening here. The fact you can remove the key in both "Off" and ACC positions suggests the ignition cylinder might be worn out. This is common in older vehicles and can cause the key to stay slightly out of the correct "Off" spot, leading to parasitic draw. Try carefully turning the key to Off and ensuring all accessories shut down. If the problem persists, replacing the ignition lock cylinder might be the fix. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.