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My 2009 pt cruiser battery goes dead overnite

Battery tests ok. A test light between negative terminal and negative cable shows a draw which cuts in half when I remove the 30 amp IOD fuses

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I had this problem as well on a earlier year PT Cruiser, i tried everything i could think of, removing fuses one by one while watching the current draw on the battery led me to the radio, after pulling the fuse for the radio the current draw dropped down to about 150mA, i don't know what was wrong with the radio but i replaced it and the problem went away. The IOD fuse supplies power to the ECU and all of the electronic control modules in the car, how much current draw are you seeing with the IOD fuse in, and how much are you seeing with it out? Its not uncommon to see a couple hundred mA in standby to everything, especially if you have the factory security system with immobilizer, chipped keys. But you may have to pull one fuse at a time to find the culprit if you are seeing a much higher draw, should be less than 1 amp at the worst.

Posted on May 04, 2017


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Here's a test you could try. Take the bulb out of the under hood light, and leave hood open. Turn off the car and lock it as you usually do. Wait about 20-30 minutes, so the computer goes to sleep. Now take off the negative battery terminal, and put a test light between the negative cable end and the negative battery post. If you have an unintended draw on the battery, the test light should be brightly lit. If it is, start pulling fuses one at a time until the light goes off. The circuit for the fuse that turned off the light when pulled is the problem. Figure out what all is on that circuit to check out what is staying on.
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