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12V sound sleep hum

  1. J

    Identify Sound Heard While MX Is Asleep

    Went into garage while car was asleep (and not plugged into HPWC) and heard a sound (more like a hum) coming from front area of car. Could this be the 12V battery charging? The car has been idle for 4-5 hours - how long would it normally take to recharge that battery? What sort of operations...