• Is there and idiots guide anywhere to finding what is draining my battery while the car is off? I installed a new one as I though the old one might just be buggered. A couple of days later and its dropped about 0.5V

  • What car.

    My top 3 guesses:

    • do you have one of those BT diagnosistc readers plugged in?
    • Sun roof
    • tow bar

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