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dead battery after a day of sitting

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I have a brand new external voltage regulator the alternator is charging at 14v says my dash. With the key on and truck off the dash reads 10v but my battery read 12.7 so if my truck sits it will drain the battery in a day any ideas? Because im lost
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Go to youtube and look up "Hotrod Garage Episode 6" They deal with this exact situation in the first 9 minutes of the episode.
 

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Did you use a key on wire on the regulator or run a hot wire from the battery?
 
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