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What is pulling my battery down overnight?

(1999 Chevrolet Silverado 1500)
in Meridian, MS on April 10, 2014
My new battery is going down overnight! I can charge it up in the mornings and I can hear some kind of little electric motor running on top rear of engine. What do you think this is?
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Popular Answer
on April 12, 2014
Do you have any aftermarket stereos, anti-theft or GPS units installed?
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on April 13, 2014
No I don't. But thanks for your reply! I found the problem, it was the abs motor running with the switch off. I took the ground cable loose and touched it back to the terminal two or three times and it went off and has not come back on again yet and I certainly hope it doesn't . Anyway thanks for trying to help! I appreciate it!
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