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kasviowhsaasd
Novice
Nov 4, 2013, 2:06 PM
Post #1 of 10
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(This post was edited by crackerjax on Jan 18, 2025, 1:44 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 4, 2013, 6:56 PM
Post #2 of 10
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Re: 02 Liberty, Battery not charging
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You need to make some electrical checks to determine what your problem is. You also may need a high end scan tool to see if the PCM is commanding the alternator or not.
With the engine running what is the battery voltage using a digital volt meter? What is the voltage at the alternator lug?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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kasviowhsaasd
Novice
Nov 9, 2013, 10:24 AM
Post #3 of 10
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Re: 02 Liberty, Battery not charging
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(This post was edited by crackerjax on Jan 18, 2025, 1:43 PM)
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Discretesignals
Ultimate Carjunky
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Nov 9, 2013, 10:32 AM
Post #4 of 10
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Re: 02 Liberty, Battery not charging
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If your getting around 14 V, the alternator is operating. Take a measurement with everything turned on in the vehicle (lights, blower, heated defrosters, etc.)
If you suspect a ground strap issue, take your red meter lead and connect it to the alternator case and the black lead to the negative battery terminal with the engine running. If your meter shows 0.5V or less, you have a good ground.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 9, 2013, 10:42 AM)
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kasviowhsaasd
Novice
Nov 9, 2013, 11:18 AM
Post #5 of 10
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Re: 02 Liberty, Battery not charging
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(This post was edited by crackerjax on Jan 18, 2025, 1:43 PM)
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Discretesignals
Ultimate Carjunky
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Nov 9, 2013, 11:32 AM
Post #6 of 10
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Re: 02 Liberty, Battery not charging
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As long as the bolt has a good path to to the battery negative, you can do that. Most techs connect to the battery terminal because you know that is the best ground to use for a reference.
It isn't unusual for some charging systems with all accessories turned on, as the engine is idling for a long period of time, for the battery voltage to drop to 12.6V or even lower. If you bring the rpm up, the voltage should come back up. This is more common on vehicles with loads of electrical accessories.
It could be intermittent charging system failure, but you have to catch it. You could also have excessive draw on the battery when the vehicle sits over night. If you have something drawing more than .050 A with the vehicle turned off, that will cause a no crank because of a discharged battery.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 9, 2013, 11:33 AM)
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kasviowhsaasd
Novice
Nov 9, 2013, 11:36 AM
Post #7 of 10
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Re: 02 Liberty, Battery not charging
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(This post was edited by crackerjax on Jan 18, 2025, 1:43 PM)
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Discretesignals
Ultimate Carjunky
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Nov 9, 2013, 11:46 AM
Post #9 of 10
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Re: 02 Liberty, Battery not charging
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The funny thing about computers in cars is that when the battery voltage gets too low, the keep alive memory gets erased. Odd things may happen when you restore power and get the engine running. The computer in your Jeep learns how to properly idle the engine and stores that information in memory, so when memory is erased it has to relearn again. During that process the engine may stall or run funny.
edit: HT beat me to it
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 9, 2013, 11:48 AM)
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kasviowhsaasd
Novice
Nov 9, 2013, 11:48 AM
Post #10 of 10
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Re: 02 Liberty, Battery not charging
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(This post was edited by crackerjax on Jan 18, 2025, 1:44 PM)
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