Q: What could be causing my truck's battery to drain when parked for a few days? on 2013 Ford F-350 Super Duty

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Shortly after taking delivery of my new truck I started to have problems with the battery being dead after it was parked for several days. I only use it on weekends and it will often be dead when I go to start it. I have no accessories plugged in. The Ford dealer can not find any problem with it and the battery checks out good when tested. Over the course of the summer I have had to jump start it several times. When I turn the truck off and exit the cab I can hear a "whining" sound that goes on for several minutes and then quits. Any ideas?
(1) Answer
(2) Comments
Did Magic City Ford check it out? They are usually pretty good! Possible battery problem, ask if they checked the batteries with a hydrometer. If one battery has a problem, have both replaced!! It's a new truck, tell the dealer to fix it!
You have the right dealer. I am not sure exactly how they checked it but will inquire next time. This is a gas engine truck so it only has one battery. Thanks!
Ok, 6.2 was thinking i read F-350 Super Duty 6.7 which is (diesel),, same deal though as far as what they should do! At one time i knew some ol boys that worked there which came in very handy but i guess they have since hung up the wereches or suits & ties for good by now.
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