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<blockquote data-quote="Zavenoa" data-source="post: 8115873" data-attributes="member: 654283">I&#039;ve confirmed that it&#039;s just too much drain.&nbsp; I did the big 3 upgrade, and that seriously helped.&nbsp; Now my battery will last a week or two, at least, before draining down to 20%, although I think it&#039;s taking a beating by getting drained down that low and then charged back up, it won&#039;t seem to go past the low 90% range without a lot of&nbsp; charging.The corolla has 100 amp alternator and 390 amp battery with run down protection.&nbsp; The run down protection is what is causing the amp start up sequence to fail when the battery gets down to between 20-25%.&nbsp; To prevent the battery from draining itself completely, and thereby ruining the recharge potential, the lower it drops below 25% the less voltage it will actually output.I don&#039;t want to just replace the battery and continue the issue, although it&#039;s possible that would fix the problem (I doubt it, still too much drain for the alt to handle).&nbsp; I&#039;d rather just do it right and drop in a HO Alt and new batt at the same time.&nbsp; It&#039;s possible I may even need a 2nd batt, but I&#039;d rather use that as a last resort.</blockquote>

[QUOTE="Zavenoa, post: 8115873, member: 654283"] I've confirmed that it's just too much drain. I did the big 3 upgrade, and that seriously helped. Now my battery will last a week or two, at least, before draining down to 20%, although I think it's taking a beating by getting drained down that low and then charged back up, it won't seem to go past the low 90% range without a lot of charging. The corolla has 100 amp alternator and 390 amp battery with run down protection. The run down protection is what is causing the amp start up sequence to fail when the battery gets down to between 20-25%. To prevent the battery from draining itself completely, and thereby ruining the recharge potential, the lower it drops below 25% the less voltage it will actually output. I don't want to just replace the battery and continue the issue, although it's possible that would fix the problem (I doubt it, still too much drain for the alt to handle). I'd rather just do it right and drop in a HO Alt and new batt at the same time. It's possible I may even need a 2nd batt, but I'd rather use that as a last resort. [/QUOTE]

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