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Unread 11-16-2010, 10:01 PM   #1
TJftw
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Jeep wont start - Checked the vitals

This is really weird:

My jeeps charge indicator went to zero while i was a few blocks from my house so I drove home right away and shut her down.

-Battery shows 12.4V
-Just tested the alternator the day before when i cleaned the terminals and its putting out 14.5V
-There is a good connection between the battery and alternator I tested with a voltmeter.
-I've removed my winch/lights/sub cables to simplify everything
-When I try to crank it all i get is the solenoid clicking
-When I hooked up a spare battery to jumper it, the motor turns over but not super fast. It should still be enough to start though. With the additional battery im getting just under 13V. Even though it turns over, it doesn't want to start!

What is wrong with my reasoning here? This just doesn't make sense to me. The next thing I will test is if I get sparks at the cylinders. If you guys can solve my problem, I promise to finally get a membership! I've been meaning to for a while now.

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Unread 11-17-2010, 10:43 AM   #2
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bump :S
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Unread 11-17-2010, 11:41 AM   #3
TXjeepTJ
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Clean your battery terminals/connectors scrape them up real good exposing new surface,make sure they are on real tight. Let me know what happens
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Unread 11-17-2010, 01:53 PM   #4
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With any starting problems i always check the 3 main causes, battery alternator and starter. i say you've got 2 out of 3 down try checking the starter. could be sticking causing the jeep to turn over slow or not turn over at all. also the connections to the starter, could be oxidized and not getting a strong connection from the battery.
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Unread 11-18-2010, 09:21 PM   #5
TJftw
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Thanks, ive checked all 3, and they look good. I charged the battery again tonight and it magically fired up! It's showing charging, but it still worries me because I didnt actually do anything haha. Ill keep an eye on it for now, and plan on getting a new battery soon.
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Unread 11-20-2010, 07:16 PM   #6
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You could very well have a low cell in the battery, it will show good voltage till you put a load on it then it falls on its face.
Also when you check your battery terminals, "looks good" don't always mean it is, cleaning them is the only way to remove any clear oxidation.
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Unread 11-21-2010, 04:02 PM   #7
TJftw
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Thanks for your responses so far. I've tried another battery and same problem. Right now it works perfectly one day, starts up fine, runs great etc. but then i'll be out somewhere and the battery meter will go to zero. If I leave the vehicle running its fine which leads me to believe that the alternator is running it fine, but after the vehicle is turned off, it wont start again. So if battery is fine, and alternator is fine, all it could be is the wiring, but i've cleaned the terminals like 3 times!! Could this be an ECU problem!?
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Unread 11-21-2010, 05:07 PM   #8
wushaw
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The alternator is regulated by the ECM, you could clean the ECM connectors and see if that helps.
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alternator problem , electrical issue , start problems , wiring
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