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The use of the vehicle will "drain a battery" the job of the charging system is to charge back the used electricity. If the battery continues to "drain" then charging system needs to be checked to see if it is faulty. It is also possible to modify a system which may not allow the charging system to keep up with the demand such as sub woofers and amps in a trunk area. A winch mounted on the front bumper incorrectly or too big for the electrical system. It is also possible for normal wear and tear to cause a system "drain".

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15y ago

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