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Unread 06-30-2013, 03:25 PM   #1
cryptic3
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Join Date: Apr 2013
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battery or alternator

So my battery dies I get a boost and starts right up... Let it run for a bit turn off and it turn on right away but if I let it sit there for a couple hours its dead... Could this be the battery or alternator... And I don't think I'm leaving any lights on or anything else?? Any clues or tips?

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Unread 06-30-2013, 03:30 PM   #2
DustyROADD
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Start the jeep and take the negative off of your battery. If it dies then your alternator is bad.
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Unread 06-30-2013, 03:37 PM   #3
Oldfrog
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I'm not sure that's correct....and I would never remove a battery cable on a vehicle with these type of electronics while it's running. You'll probably be buying a new PCM if you did.

Get the battery load tested.Check out the alternator and all the battery connections. Dont just look at them...remove them and clean them.
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Unread 06-30-2013, 03:43 PM   #4
a70eliminator
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Your battery is loosing charge, it's bad, you need a new one.
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Unread 06-30-2013, 03:56 PM   #5
cryptic3
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Yeah I read that taking off the negative cable can cause a shortage and damage the computer components. I've clean the battery cables a few months back I rechecked them they are fine. Guess I'll go and get the battery tested
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Unread 06-30-2013, 04:32 PM   #6
dnuccio
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NEVER take off a battery cable with the engine running. you'll fry the PCM. if it starts after you get a boost, and starts again shortly after you turn it off, your alternator is working fine. its the battery
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Unread 07-02-2013, 09:50 AM   #7
cryptic3
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I unplugged my battery when I got home after work in the afternoon and I disconnected the cable wires from the battery and this morning I connected them back and it was dead.... Thanks for the tip guys
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Unread 07-02-2013, 10:45 AM   #8
um7267
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voltmeter should read 13.3-14.7 at start up, and after its running it should settle to 13.7

if the alternator is dead it would read 12.28+/- and be dropping
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Unread 07-02-2013, 10:58 AM   #9
cryptic3
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Yes I checked the voltmeter the battery doesn't hold a charge it was a battery from Walmart... The sticker says 1/07 that was 6 years ago.... Wonder if I should go back to Walmart and get another battery from there... However I went to auto zone online and put in my jeep specs and it say my jeeps recommended CCA is 800 but that battery is 650 CCA ?????
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Unread 07-02-2013, 11:37 AM   #10
AaronButler
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Ive had good luck with Batteries from Autozone. I did have one go bad about a year and a half after I bought it, but when I went in (fully expecting to just buy a new one) they replaced it free of charge.
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Unread 07-02-2013, 11:40 AM   #11
zj97ltd
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I think 6+ years is pretty good in a ZJ. My '97 Orvis ate batteries. I think the heat got to them. The Wal-Mart yellow ones had a 3 year warranty, and they'd never last that long. BUT they never gave me a hassle replacing it.
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Unread 07-02-2013, 12:44 PM   #12
PolkaPower
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If the battery was dead then you jumped it to start it will not be anywhere near charged enough by the alternator to start again later. If your battery dies you need to put it on a trickle charger over night. You could drive it around all day and the alternator will not come close to fully charging a battery.
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Unread 07-02-2013, 07:10 PM   #13
dusterdude
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Your wm batt is 6 years old,you should frame that sucker.6 years is damn good life out of a batt
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Unread 07-02-2013, 07:13 PM   #14
Mickey_D
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Quote:
Originally Posted by dusterdude View Post
Your wm batt is 6 years old,you should frame that sucker.6 years is damn good life out of a batt
This.

The expected life of a car battery is 3 to 5 years. If you got 6 years out of a Walmart Special, you did good man.
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Unread 07-02-2013, 07:26 PM   #15
cryptic3
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Lmao wow I feel honor like if I did something awesome Lol I think the battery is to heavy to frame I'll take a picture instead
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