What can cause battery drain on a F350?
Just setting for a week can run the battery down. you need to
make sure that your grounds are good, that your alternator is
charging at the proper rate and that the voltage regulator is
working properly. If all of this is good then you can start
unplugging things that drain the battery, radio, power door locks,
interior lights etc.. Or if you know how to use a multimeter you
take measurements to try to figure out what is draining the
battery. Just be aware that a bad ground and all of the stuff that
is contantly on (clock, radio memory, ECU memeory...) will drain
the battery some. the process of driving the auto daily maintians
the battery charge. The newer the vehicle the more power they
usually draw an a daily basis. With out further info it is
impossible to know what is going on.