Jeep won't hold a charge - JeepForum.com

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post #1 of 17 Old 06-16-2010, 07:04 AM Thread Starter
allysdad
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Jeep won't hold a charge

My 2003 Jeep Wrangler won't hold a charge. Fairly new battery. I can start it while being charged, but if I take my foot off the accelerator it dies. I've been told that it probably isn't the alternator because there's no clicking when I try to start it without being charged. Any suggestions? I'm a somewhat clueless female who would rather not have it towed if I don't have to!

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post #2 of 17 Old 06-16-2010, 07:10 AM
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Have you taken the battery out and charged it yet? If you drained the battery down, the alternator probably won't be able to charge it back up. I'm not sure what a "click" noise has to do with an alternator, though...

If it's worth doing, then it's worth overdoing.

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post #3 of 17 Old 06-16-2010, 07:17 AM
TheBoogieman
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Auto parts places will check the battery and alternator free.
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post #4 of 17 Old 06-16-2010, 07:47 AM
dieselcrackel
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What does "fairly new" mean? If you can start it while on the charger or being jumped started from another vehicle then more then likely the battery is no good.
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post #5 of 17 Old 06-16-2010, 08:29 AM
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get a digital voltage meter, check your battery voltage.(12 volts plus) Then start your jeep and check it again while running. (13 volts plus, most will put out about 13.5 to 14 )

Check your connections and cables

If your not getting over 13 volts while running (alt) is toasted.

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post #6 of 17 Old 06-16-2010, 09:24 AM
Jerry Bransford
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Put the battery on a bench charger overnight. A battery that goes dead & then isn't completely recharged will just cause problems. No, an hour or two on a bench charger isn't enough and driving it around isn't going to completely recharge it either. And a dead or nearly dead battery will, absolutely, cause the engine to die at idle. The ignition needs +12v and so does the alternator to work.

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Originally Posted by dirtsquirt View Post
get a digital voltage meter, check your battery voltage.(12 volts plus) Then start your jeep and check it again while running. (13 volts plus, most will put out about 13.5 to 14 )

Check your connections and cables

If your not getting over 13 volts while running (alt) is toasted.
If the battery is dead or nearly dead, you won't get 13 volts from the alternator. The type of alternator the TJ uses doesn't work when the battery is dead or nearly dead.

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post #7 of 17 Old 06-16-2010, 09:39 AM
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Originally Posted by Jerry Bransford View Post
And a dead or nearly dead battery will, absolutely, cause the engine to die at idle. The ignition needs +12v and so does the alternator to work.
I think Jerry's answered this question about three times in the last week.

If it's worth doing, then it's worth overdoing.

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post #8 of 17 Old 06-16-2010, 09:42 AM
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Quote:
Originally Posted by Sundowner View Post
I think Jerry's answered this question about three times in the last week.
And another 10 thousand in all the auto vs manual threads because the manual owners always think they can push start their rigs with a dead battery.

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post #9 of 17 Old 06-16-2010, 10:05 AM
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Quote:
Originally Posted by Sundowner View Post
I think Jerry's answered this question about three times in the last week.
Also, just as many batteries go bad when it is hot out.
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post #10 of 17 Old 06-16-2010, 10:15 AM
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Also, just as many batteries go bad when it is hot out.
Batteries go bad for a lot of reasons.

The point of my statement was that I am starting to get an idea of exactly how often the same questions are asked over and over again. I, myself, have answered that same question more than once in the last few days. However, Jerry is an acknowledged master on the subject (as are others), and me...well, I'm just glad to be here.

Also, the point was that with even the most casual of searches, people can find answers without needing to start a new thread.

If it's worth doing, then it's worth overdoing.

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post #11 of 17 Old 06-16-2010, 10:18 AM
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Quote:
Originally Posted by allysdad View Post
My 2003 Jeep Wrangler won't hold a charge. Fairly new battery. I can start it while being charged, but if I take my foot off the accelerator it dies. I've been told that it probably isn't the alternator because there's no clicking when I try to start it without being charged. Any suggestions? I'm a somewhat clueless female who would rather not have it towed if I don't have to!
That clicking would be your starter not getting enough juice from the battery.

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post #12 of 17 Old 06-16-2010, 05:08 PM
mightydog78
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my battery wasnt holding a charge and i got a new alternator only to find out my battery needed a good charge

but get them both tested if you can, the alternator is super easy to take out

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post #13 of 17 Old 07-12-2012, 08:24 AM
aussieTJ-06
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Yep i did the same thing just bought a new alternator and was gonna charge my yellow topper tmrw and run some tests but now after reading this apparently all i need is a good charge to let the alternator take over from there CHEERS GUYS! the battery cost me 400 bucks here! i wos worried ide have to get a new one
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post #14 of 17 Old 07-12-2012, 08:35 AM
brianmlove
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400 for a batter wth kinda battery are you buying
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post #15 of 17 Old 07-12-2012, 08:37 AM
jamesrw30
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I didn't have the problem of it dieing at idle, but I was having a problem with it not charging to proper voltage when running and it ended up being a computer and a burnt pin on a plug. I know this may be a long shot but it is worth keeping in mind maybe.
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