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Does anyone know why my aux. battery in my 2003 silverado keep failing? I've gone through 2 Optima yellow batteries both brand new for that aux. batterty position. Does the alt. charge this battery? Why doesn't it help the main battery when the main battery is low? What does this aux. battery power? What is it for? Can I wire up this thing to the main battery to make it stronger? Any advice, comments, teachings, schoolings would be greatly appreciated for this newby. Thanks
 
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