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Message: <blockquote data-quote="skdooley" data-source="post: 7124198" data-attributes="member: 627957"><p>Your vehicle uses 30% to 50% of the amperage your stock alt produces. So, if you have a 90 amp alt, its using atleast 35 amps or so. That leaves 55 amps for additional use. 55 x 14.4 (or whatever your alt charges at) is 792. So roughly you have 800 rms free to use. What happens is, when you pull more amperage than you have available, you're running off your batteries. Since you're pulling more amperage than your alt can handle, it can't charge the batteries which you're drawing off of. Mix that with cold temps and that's whats causing them to die. Contact DC Power Engineering or Mechman for a price quote. I have a celica and they have a 180 amp alt for me that does 120 amps at idle and its $389. Pretty good deals.</p></blockquote><p></p>

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