I have a 2007 300C HE. While the car is off and all doors closed with the keys out of the ignition, every minute or so I'll hear a clunk in the rear end, followed by dash lights blinking once, followed by the gauges pulling down below zero, then returning to zero. This is draining my battery overnight. New alternator, new battery. Confirmed charging system. I've searched these forums for 1.5 weeks, and can't find anyone with issue.
Battery drain while car is off!
Heritage300cTexas
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Yeah, we're way beyond all of that. It's a draw, and it ain't parasitic. Hooking up to a SnapOn Helios this evening, hopefully that'll tell me something.
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Parasitic draw tests are great for a constant draw, for sure. A true waste of time is doing a parasitic draw test on a drain that happens in intervals. Multiply interval by component, and you're over 16 hours with a meter. Boy, now that's a waste of time.
Any progress on this?
One culprit that has often been the cause of battery drain on other makes of car, is an interior light failing to extinguish and specifically the trunk light. I've had direct experience myself with this problem: before I bought my 300C, I had arranged a test drive in a new Toyota Prius (!). The car refused to start because the battery was flat. Not the main motive power battery, but the small 12V auxiliary battery, which supplied the interior lights. It transpired that the trunk light had been failing to switch off. After some delay for battery replacement, the test drive continued OK, but my wife stated that she had no interest in a new car which failed to start on a test drive and she eventually chose our current vehicle.
One culprit that has often been the cause of battery drain on other makes of car, is an interior light failing to extinguish and specifically the trunk light. I've had direct experience myself with this problem: before I bought my 300C, I had arranged a test drive in a new Toyota Prius (!). The car refused to start because the battery was flat. Not the main motive power battery, but the small 12V auxiliary battery, which supplied the interior lights. It transpired that the trunk light had been failing to switch off. After some delay for battery replacement, the test drive continued OK, but my wife stated that she had no interest in a new car which failed to start on a test drive and she eventually chose our current vehicle.
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I have a 2012 300C with battery drain and I, too, have noticed my instrument cluster waking up while the car is sitting in the driveway or garage. i have no idea why. The "thud" i hear seems to sound like a blend door behind the dash. did you ever find a solution for this?
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Could it have been the cigarette lighter charger because I noticed these charges are 2.0 A some 3 A 12 V also let me know if it could’ve been a cigarette lighter charger
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Also, I’m having this problem now, but I’ve changed all the settings on the car to power off after 45 seconds
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