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Old 11-09-2011, 03:24 PM   #1
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Starting issues battery about dead

Lately my jeep has been having really bad stsrting issues. The battery always seems to be almost dead. When I turn the key it barely cranks but I get lucky sometimes and it will have just enough juice to fire up. I have checked the battery and it is charged and when I dont have enough juice to start the jeep I have plenty of light and radio power to them still.

After jeep runs for a little I shut it off and the battery will be fine unless it sits for a little bit

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Old 11-09-2011, 03:26 PM   #2
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Sounds like the alternator is giving up the ghost. Take it to the nearest Auto Zone or Advance Auto Parts store and they can test it for you in short order.

That said, have you recently added any accessories that require a power source?

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Old 11-09-2011, 03:57 PM   #3
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Have the battery load tested, it could be carrying just a surface charge...How old is it?
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Old 11-09-2011, 06:39 PM   #4
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I just went through this with mine. Lights would not dim but the battery seemed like it was dead. Turned out to be the starter. It had a dead spot. I think that the brushes were barely making contact because when I tapped on it with a hammer, it would start. Now she fires right up....like a new starter should.
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Old 11-09-2011, 09:08 PM   #5
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can you confirm that the battery is actually loosing charge??? this happened to me but it turned out my regulator screw was not tight, and the engine would struggle to turn over. if the engine timing is to retarded it may struggle to start.



If it is the start here is a nice video that explains how the starter works.
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Old 11-10-2011, 08:01 AM   #6
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Quote:
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Have the battery load tested, it could be carrying just a surface charge...How old is it?
I'm with Garyk. You have to rule the battery out before you move on. If it's 3-4 yrs. old I would consider replacing it anyway. You need to know how it load tests and the condition of your alternator. If your alternator isn't properly charging the battery whether it's new or not isn't going to matter, it will always run down. If by chance everything works out then I would be possibly looking at a dead short which could be draining the battery in between cycles.
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Old 11-10-2011, 08:12 AM   #7
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I think everyone is on the right track, with the increasing cold older batteries that seemed great might go into shock and lose the inner cells. The inner cells are where most of the cranking amps come from. The battery might volt test decent and run the accessories but fail to start the jeep. The battery is a good place to start.
BUT...
If you are taking it to an auto parts store any ways, you might as well have them test the alternator too. Its not a big job to pull it and hand it to them.
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Old 11-10-2011, 09:27 PM   #8
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I'm with Garyk. You have to rule the battery out before you move on. If it's 3-4 yrs. old I would consider replacing it anyway. You need to know how it load tests and the condition of your alternator. If your alternator isn't properly charging the battery whether it's new or not isn't going to matter, it will always run down. If by chance everything works out then I would be possibly looking at a dead short which could be draining the battery in between cycles.
I think the OP said that the radio plays and the headlights don't dim while the starter is sounding like dead battery. Those symptoms demonstrate that the battery has a full charge but somehow the starter is not turning with good torque. I initially thought that my battery was gone so that is where I started. Then because of the condition of my wires, I replaced those.....the whole harness.....that is how Chrysler sells it. Problem still there. When I replaced the starter, it now starts the way is should. So, with those symptoms, I would lean starter. It is easy to test. With the jeep in neutral and the brake on and wheels chocked, take a jumper cable and connect only the positive lead. Using the other end of the jumper cable go directly to the starter past the solenoid. If it turns the engine normally, replace the cables. If the starter doesn't turn well, replace the starter.
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Old 11-11-2011, 07:26 AM   #9
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Quote:
Originally Posted by jk'n View Post
I think the OP said that the radio plays and the headlights don't dim while the starter is sounding like dead battery. Those symptoms demonstrate that the battery has a full charge but somehow the starter is not turning with good torque. I initially thought that my battery was gone so that is where I started. Then because of the condition of my wires, I replaced those.....the whole harness.....that is how Chrysler sells it. Problem still there. When I replaced the starter, it now starts the way is should. So, with those symptoms, I would lean starter. It is easy to test. With the jeep in neutral and the brake on and wheels chocked, take a jumper cable and connect only the positive lead. Using the other end of the jumper cable go directly to the starter past the solenoid. If it turns the engine normally, replace the cables. If the starter doesn't turn well, replace the starter.
As long as the battery load tests good and the alternator tests good, I agree, you got it.

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