I have a 2011 F250 Supper Duty with a 6.2 gas engine, overnight something will draw 2.2 to 3 battery volts, enough that it won't start without the jump box. It only happens at night and not ever in the daytime? It happens with the truck locked or unlocked Any ideas were to start looking? There are no lights showing overnight, I've checked a few times overnight. It sit's at my shop the same length of time during the day and there is no problem. There are no after market accessory's installed! Odd thing is it doesn't do it every night, it's random but becoming more common this week!

 

Where is the remote kept at those different times ?

 

The remote is in my pocket all day at my shop, about 100 feet from the truck and in my pocket in my house at less then that distance all night The remote is an aftermarket that was programed to allow the truck to start and lock the doors but not by a ford store, was programed by a lock smith. I bought the truck a year ago and this random issue has started 6 to 7 weeks ago. it was random but now has done it the last 7 days in a row.

 

Do you have dual battery and/or dual alternator?

 

no. it's a gas motor with 1 new battery that has been checked by 2 separate places and 1 alternator that charges at 14.1 volts

 

Above battery drain test is for 2007 F250 Super Duty 5.4L from my alldata software, I don't have any for 2011.

 

This is something you might try.
You can wrap your remote in tin foil when you are home, or increase the distance between your remote and your vehicle as when at the shop.
What we are trying to eliminate is signals from the remote that keep the modules in your vehicle from going into sleep mode after you park your vehicle for the night.
Please let us know how you make out with this, thanks..

 

I'll try it tonight!!

 

tried it but no change, still had to jump the truck this morning!

 

There is a fault in the instructions.
Pulling fuses allows the faulty module to reset and when you reinstall the fuse ,no fault will show up..
The better way to find the problem is to measure the voltage drop across each fuse.

This requires a little knowledge of voltage drop testing. There are several videos to explain the procedure.