Battery Dead after 3 to 4 Days

[GatorHunter]

I'm currently working overseas, and this is what my wife has told me.

She drives the Mustang as a daily driver, but on bad weather days she drive the truck. She had several days of bad weather and never started the Mustang, when the weather got better, she tried to start it and it would not start. She took the jump box and started it easy. if she uses the car daily she has not problem, only if it sits for several days. this has happened 3 times already and is not normal. i could see it if it would sit for weeks at a time, but not just for a few days. my guess is there is a slow power draw somewhere. anyone else have this issue?

I told her to take it back to ford, but she is stubborn and dont want to loose the mustang for that long, she may just have to suck it up and do it.

btw its a 2016 gt prem auto, completely stock. except for window tint.

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[WhiteyDog]

I had somewhat of a similar situation, but mine sat for weeks. It was over winter last year, but I would go out to start it up once a week or so, but it still went dead. Called the Ford dealer and they told me I would have to bring it there in the car. I tried charging it, but it was dead. The car was new, which pissed me off. I got another battery and a battery tender and it hasn't gone dead since. The dealer said our cars do a self diagnostic of its systems every so often because all of the electronics, and it drains the battery over time if it sits too much.

 

[Bartly]

Mine just spent a week on jackstands with me in the cab lots of times with the lights on over that time. Saw this thread before I started it up today and was concerned, but she fired right up without any problem. Funny the engine sounded grumpy even though I wasn't working on it, sounded like it either didn't like being woken up or like it was angry at me for not joyriding it all those days in a row.

 

[SAL-E]

Have you load tested the battery? You either have a high parasitic drain pulling down the battery, or the battery itself is marginal. Also possible that the charging system is not working properly, but that is pretty unlikely.

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