Does anyone know of any common Key off-Engine off power drains on '05-09 Mustangs?

Discussion in 'Mustang Chit Chat' started by ghunt81, Oct 20, 2022.

  1. Fullboogie

    Fullboogie King of the Ski - OG Jr.

    I know it's an old thread, but my '07 GT500 came with the crappy Shaker 500 and I always have had battery drain problems. I spent hours doing proper load tests and never could ID any circuit that was causing it. Installed an aftermarket (Pioneer) head unit and it still does it. I hate having to keep the car on a trickle charger - it's the one thing I hate about this car.
  2. ghunt81

    ghunt81 New parts on old junk! S197 Team Member

    That sucks. Mine was good up until a few years ago- I never added any electrical equipment during that time so I don't know what the issue is. I just have to disconnect the battery if the car is gonna sit for more than a week which generally isn't a big deal.
  3. DieHarder

    DieHarder Senior Member

    Mine is the same but I have replaced the map bulbs w/LED's so that's likely the source in my case. Stock stereo and like you I have to disconnect the neg cable of the battery to prevent batt drain. The problem has killed two batteries over the last few years. Got a digital charger to keep the battery conditioned. So far, so good.
  4. ghunt81

    ghunt81 New parts on old junk! S197 Team Member

    I've had LED's in my map lights since probably the second year I owned my car and I've had it for 12 years, so I dunno. Those draw so little current I can't imagine them draining the battery but who knows.

    Now that I installed a new head unit I would be curious to see if it's better but I don't want to draw the battery dead again, I had to replace it a couple years ago because of that.
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