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Get a "Settings Keeper" <NOCO brand from Walmart in the automotive section by the car batteries>. Follow directions...basically, you plug a 9-volt battery into the cigarette lighter and that supplies power to keep the computer, radio, etc. settings while you change the battery. The "little electrical box" on top of the battery is not involved at all in replacing the battery!

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15y ago
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Q: How do you replace the battery on a 03 VW Jetta with a little electrical box on top?
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