I am a new owner of a 2005 f150 5.4 supercab. I want to leave it for 2weeks in sub zero weather . will the battery drain down or is there a switch to cut off the battery drain at a certain voltage.

 

ther is no switch to stop the battery drain at a certain level. the only thing i can think of is to take the battery out and keep it warm for the duration of your trip. that will aloow you to maintain the battery level and not have to battery die.

 

If the battery is in good condition, it won't drain enough in 2 weeks to be a problem.
Heavey oil is a bigger problem, if used. Best to make sure you have the 5w20 blend in place.
Removing the battery reboots the PCM, so if you see different drivability when driving again, that's why.