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Message: <blockquote data-quote="dipitydoo" data-source="post: 7454026" data-attributes="member: 567383"><p>assuming your alternator is stock, it may have problems properly charging both batteries.  this could lead to both batteries draining down from inadequate charging.  running the deep cycle battery alone may help, they are not normally designed as a standalone battery for starting the car.  they typically have a much lower cold cranking amp rating, so make sure it has enough to start your car.</p></blockquote><p></p>

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