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Old 12-28-2009, 03:24 PM   #1
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Electrical Issues on 98 TJ

Has anyone ever had this problem? Ive had 2 different places check my battery and alternator in the last 3 days and tell me they're both fine! I unplugged and cleaned my battery terminals, and cleaned the chassis connections, and my voltmeter STILL jumps from average to no voltage every time i start the jeep, and will eventually die after driving for an hr or so...after having it jumped,it runs fine for about an hr, and eventually dies on me again!

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Old 12-28-2009, 05:27 PM   #2
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Next time, turn the lights on and see if it dies faster. If so, you have a bad battery or the charging system is not working.

And have your battery tested. Many auto parts stores will do this for free.

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Old 12-28-2009, 05:34 PM   #3
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Originally Posted by mmessman View Post
Has anyone ever had this problem? Ive had 2 different places check my battery and alternator in the last 3 days and tell me they're both fine! I unplugged and cleaned my battery terminals, and cleaned the chassis connections, and my voltmeter STILL jumps from average to no voltage every time i start the jeep, and will eventually die after driving for an hr or so...after having it jumped,it runs fine for about an hr, and eventually dies on me again!

I think he did but it does sound like a third opinion may be necessary. Let me guess was the person checking the batt. and alt. a autozone expert or a person that knows auto electrical systems?

Make sure the person checking the batt put a load to it when they test it as just checking the voltage won't tell anything.

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Old 12-28-2009, 05:44 PM   #4
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After your jeep shuts down, what happens when you attempt to restart it with the key? Does it crank but not start or are you just getting a clicking sound? What are your guages doing/reading when you try to restart? One more thing that you might want to check is the cables themselves. Check for signs of wear or abrasions.
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Old 12-28-2009, 06:08 PM   #5
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Sounds like a dead short in either the main wire for the alt. or something in the jeep that gets juice once the engine is running. If you just turn the key on without starting the engine what does the gauge do?
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Old 12-28-2009, 07:07 PM   #6
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You say "after having it jumped,it runs fine for about an hr, and eventually dies on me again! " The assumption is that your battery is completely dead.

If it is dead, jumping is charging it up enough to run for an hour. If you turn on the lights, it may only run for 1/2 that time. this would indicate the amount of charge in the battery is very small, and that it is using up the small amount of energy faster.

Why do this? It will tell you that it is probably not a loose wire in the load side of the battery. But probably something to do with the charging circuit.

And, yes, make sure the battery is tested with a load tester.

...the battery itself could still be bad if it has a problem like a loose plate. If the battery is near the end of it's life, replace it.

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