Battery keeps dying!
Posted 29 October 2017 - 08:20 AM
Posted 03 November 2017 - 07:53 AM
Definitely sounds like a bad alternator. I wouldn't suspect corrosion on the terminals on a 2014 in Texas. But it wouldn't hurt to check them. Possibly under warranty still?
Posted 04 December 2017 - 11:41 PM
Posted 05 December 2017 - 04:12 AM
No. Don't do that.
The battery doesn't just store power for the starter motor. It also filters out the noise the alternator makes, noise which the endlessly multiplying electronics in modern cars may or may not be able to deal with. This may have been a valid test on cars of the 60s and earlier, but I wouldn't do it to anything fuel-injected. There are too many expensive things that could go wrong.
+1 for a failing alternator. The battery light on the dash isn't a trouble code that hasn't cleared yet, it's a sign the alt isn't charging. A buggered alt can also make the battery run down overnight, if a diode is shorted, though it sounds more like the battery just ran down as you drove home and you got lucky (the lights and electronics didn't discharge the battery enough for them to quit before you got home). Get a new alt in there and/or get it on a charger ASAP, lead acid batteries don't respond well to sitting around discharged for extended periods.
Also +1 for making it someone else's problem if it's still under warranty.
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