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99si w/ ls wont stay unless jumper cables stay on

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Old 11-22-2010, 12:58 AM
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Default 99si w/ ls wont stay unless jumper cables stay on

just put a 2001 ls motor into a si the car has been sitting for a while...the car had a dead battery so we jumpstarted it and it starts...now heres the problem after the jumper cables are taken off the car stumbles out and dies but if you put the cables on it'll idle fine....tried a different battery and alternator but the still the same results....any help is appreciated
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Old 11-22-2010, 04:20 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

Bad ground somewhere?
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Old 11-22-2010, 06:41 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

Did you put the batteries on a tester to make sure they were good?
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Old 11-22-2010, 08:11 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

i dont think that the batt would matter after you jumpstart when the jumper cables are taken off it should still run...checked for loose grounds too no luck
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Old 11-22-2010, 09:12 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

Originally Posted by 00si
i dont think that the batt would matter after you jumpstart when the jumper cables are taken off it should still run...checked for loose grounds too no luck
If the battery is bad and wont hold a charge the car will die everytime the jumper cables are removed. If you dont believe me then google it.
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Old 11-22-2010, 09:48 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

Im ganna save tatrat a post and say blast it with piss!
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Old 11-22-2010, 11:08 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

You have a problem that is affecting the battery and the alternator, because neither sound like they are powering the electrical system after the jumper cables are removed.


Ok, here's a good question: EXACTLY where are the jumper cables clamped to when it actually runs?
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Old 11-22-2010, 11:26 AM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

This alternator that you put on was it new or used? Came out of known good car etc? Possible grounding issue. Or other alternator is bad too.
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Old 11-22-2010, 05:40 PM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

alternator fuse is a possibility as well
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Old 11-22-2010, 05:42 PM
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Default Re: 99si w/ ls wont stay unless jumper cables stay on

Originally Posted by Scoutn757
alternator fuse is a possibility as well
Should still run off of the battery without the alternator.
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