need help, my f150 is beeping under the dash around the fuse area, and I am haveing a few electrical problems, the dealership says they can't find anything wrong , has anyone ever had this happen to them, or have any guess as to what is causing the beeping sound, it beeps about every 20 minutes, 16 beeps at a time in groups of 4 beeps. please advise it is driving me crazy, thank you in advance.....Phil

 

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