chunks6067 Posted August 21, 2009 Share Posted August 21, 2009 so I'm working on a 95 xj, 4cylinder manual transmission, that has a problem. I first diagnosed it as a bad alternator because it would die shortly after start with a good battery, or a good jump. Then i took the alternator off got it tested, and it was good. i also had the "good" battery tested and it was dead, warranty replaced it then took it to the jeep, checked all the hookups and it worked ran for about 2 days, now i have a bright red battery idiot light on. any advice i would greatly appreciate. Quote Link to comment Share on other sites More sharing options...
jpdocdave Posted August 21, 2009 Share Posted August 21, 2009 the idiots at autozone or wherever it was tested don't know what they're doing. i've heard way more bad alternators called good by those idiots than they've ever gotten right. if the light is on now, put a voltmeter on it, and test the output right at the alternator. Quote Link to comment Share on other sites More sharing options...
Pete M Posted August 22, 2009 Share Posted August 22, 2009 I first diagnosed it as a bad alternator because it would die shortly after start with a good battery, or a good jump. How soon is "shortly"? Fully charged battery? Quote Link to comment Share on other sites More sharing options...
HOrnbrod Posted August 23, 2009 Share Posted August 23, 2009 Measure the charging voltage across the battery w. the engine running at about 1.5K RPM. Should read at least 13.3VDC. Quote Link to comment Share on other sites More sharing options...
chunks6067 Posted September 1, 2009 Author Share Posted September 1, 2009 I first diagnosed it as a bad alternator because it would die shortly after start with a good battery, or a good jump. How soon is "shortly"? Fully charged battery? about a mile up the road I just havent got back to working on it because of school i think this weekend ill try a voltmeter to get a good reading Quote Link to comment Share on other sites More sharing options...
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