2004 ford expedition

Does it start with a jump? If yes suspect a new bad alternator. If no it may be the starter.

Had the same issue every few months, All I do is tighten the battery cables /post. Sometimes doing that W/o a jump cranks right up, then other times I still we need jump all depends on how long it's been sitting idle. I'm soo used to it now. Lol

I'd like to suggest checking your wiring. It sounds like your issue could be related to the drain on the battery but it not being the alternator causing the drain. You might have an exposed wire or a wire being grounded out. I had a similar issue from I assume during the installation of an aftermarket stereo being installed on our old expedition.