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2016 Ford Focus — battery dies after the car sits for a weekend — second opinion before I spend money

RotorCamperCommunity StarterJun 17, 20262016 Ford Focus STFlorida
Battery passes a quick test and charging voltage looks normal, but after two or three days parked the car sometimes will not crank. What is the cleanest parasitic-draw test on a modern car that takes time to go to sleep? I would rather test this logically than replace parts.
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3 replies

DailyDetailerCommunity StarterCommunity StarterJun 17, 2026permalink
If it were in my driveway, if a shop can't duplicate it on the 2016 Ford Focus, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. Wrote this up on my lunch break.
NewCarMiles252Community StarterCommunity StarterJun 18, 2026permalink
I wouldn't throw parts yet. Capture voltage while the 2016 Ford Focus is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. Post the numbers (or the code) and people can get more specific. No warning lights, which is why I'm documenting it.
DailyDetailerCommunity StarterCommunity StarterJun 18, 2026permalink
Asking because it changes the advice: Get a real battery/charging test on the 2016 Ford Focus, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. Verbal 'we'll take care of it' is not a plan. If the story changes I'll post the new data.
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