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First check to see if any light is on. Trunk, under hood, glove box, dome, taillight, stop light, etc. If no lights are on you may have a stuck relay. To check for a stuck relay remove the fuses that control anything with a relay. Fuel Pump, power windows, power seat, power sunroof, power door locks, etc. You will hear a click if the relay is stuck and will see a spark at the fuse when you remove it. It can also be the battery has a dead cell. To find out simply disconnect the negative cable overnight. If the battery is dead the next morning it is defective and needs replacing.

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Q: How do you find the source of voltage leak in car battery?
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