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If you see a spark then something is on pulling power from the battery. If everything is turned off on the vehicle then you should not see any large spark. You will see a very tiny spark because the radio presets and the clock will be drawing a slight amount of power, but if the spark is very large then look for something that is pulling power. A light on somewhere or a stuck relay.

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Q: Why does the battery posts spark when you hook them up?
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