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The battery and alternator have been checked out and are good. I can drive the truck all day and it stays charged, but I must disconnect the battery cable when I park it overnight or it will be dead in the morning. I have checked wiring on all the harnesses and they look good. Where do I look next? Is this a common problem with Fords?
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Penny, If battery is indeed good, you are experiencing what is known as a parasitic drain of battery. Parasitic drain means something is using power when it should not be, could be a aftermarket alarm/stereo, stuck relay, shorted wire/switch, faulty alternator, etc. I will post a link to show how you can check your vehicle for parasitic draw by pulling fuses and checking amp draw/power with a DVOM. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
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Some short circuited then some current all time flowing that's battery drain
@lpfaff1 Excellent choice for a teaching video , really like using ETCG stuff for simple explanations
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If alternator is and batter are good checks the starter and starter solenoid they can draw power (parasitic draw )
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