Odd noise while car is off. Resulting in dead battery

fyeRc51

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Jan 11, 2011
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jacksonville
2016 ecoboost mustang.

Was washing the car and kept noticing every few minutes I would hear a noise. Sounded almost like a pairing of a buzz and a click similar to what you sometimes hear when putting an automatic car in gear(my vehicle is a 6 spd). Shortly there after, the next day the battery is dead. I went and got a new battery a few weeks later bc it’s not my only car. And I didn’t notice the noise for almost a month. It came back yesterday. And of course this morning, car was dead. Again. Any ideas?
 

Black02GT

*Not 2KBlackGT
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Dec 12, 2004
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NY
Other possible cause is the alternator diode issues or it being triggered when the car is off. Usually more of a hum then a click though.
 

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