Battery Gauge Drop. Check Gauges. - JeepForum.com

 
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post #1 of 13 Old 09-12-2011, 08:35 PM Thread Starter
dkongkill
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Battery Gauge Drop. Check Gauges.

Hey all, so tonight i got in my jeep as usual and something different happened as i was driving. the check gauges light came on and my battery gauge dropped all the way down and my headlights got real dim. nothing has happened like this ever and nothing seems to be broken to make this happen to my knowledge. my battery is only a year old. what could be causing this problem? any help is greatly appreciated.

Thanks

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post #2 of 13 Old 09-12-2011, 08:40 PM
racerex1
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I would have the alternator tested. That sounds like the culprit.

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post #3 of 13 Old 09-12-2011, 09:01 PM
Reptile
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I would have the alternator tested. That sounds like the culprit.
X2

Typical of an alternator going bad; and it will throw a code. You can run a quick test the atlernator with a digital voltmeter. Should be around 13.5-14V or so at the battery while eng running. There is a voltage differential between engine off and engine on (when atlernator is charging), if not, the alt is not charging.

There should be like a stud behind the alternator, try to move it see if power comes back. This worked temporarily for me to keep the battery somehow charged til I got around to fix it... Don't wait too long cause you'll drain the battery and shortens its life quickly, not to mention you'll get stuck somewhere.
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post #4 of 13 Old 09-13-2011, 03:57 AM
oakmckinley
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X2
My Alt recently died and not realizing it drove it, (just around the block) I was running on just the battery and killed that too.

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post #5 of 13 Old 09-13-2011, 07:10 AM
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My alternator never threw a code but did have a similiar set of problems before it died.

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post #6 of 13 Old 09-13-2011, 09:59 AM Thread Starter
dkongkill
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thanks for the help guys ill get my alternator tested immediately.
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post #7 of 13 Old 09-15-2011, 02:43 PM Thread Starter
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it indeed was the alternator and i replaced it immediately. the problem has been solved thanks everyone.
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post #8 of 13 Old 05-13-2016, 07:59 AM
colinsmama08
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hey guys so i have the same issues with my jeep now however we took the alternater to have it checked and it passed but when we put it back in it still does the same thing
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post #9 of 13 Old 05-13-2016, 08:20 AM
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hey guys so i have the same issues with my jeep now however we took the alternater to have it checked and it passed but when we put it back in it still does the same thing
Check to see if you have a fusible link. They go somewhere between the alternator and battery act as a fuse to protect wiring . On my jeep it goes from the alternator to relay.
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I dunno but from those symptoms, I'd first suspect the ignition switch and start from there. I'd especially suspect the ignition switch if you don't hear the fuel pump briefly cycle on-off when you first turn the ignition switch from off to on.
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post #10 of 13 Old 05-13-2016, 09:13 AM
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post #11 of 13 Old 05-16-2016, 08:03 AM
colinsmama08
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Update** I changed the alternator like someone said they did anyways and it works just fine now it was going bad so it passed the test at O'Reilly but that was the issue in my jeep. Thank you all for your help
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post #12 of 13 Old 05-16-2016, 05:30 PM
CJ7-Tim
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A fusible link either is good or bad.

If the gauge shows 9 volts, it is likely the alternator brushes are worn out and getting stuck. A bump in the road or knocking it around while removing it usually frees up the brushes. That is why the problem is often intermittent, and also why the alt will often test good inside the store, but continue to have issues. If gauge show 19 volts there is usually a loose/damaged wire connector issue or a faulty/damaged/corroded wire cable issue.

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post #13 of 13 Old 05-17-2016, 10:27 PM
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I used to have this issue on a 99 xj when I was living in NC. Turns out the salt air got to the wires, on the battery. once I stripped them down, and put new terminals on It fixed the issue. Mine would spike voltage, or show none at all. Just for future reference. Nothing worse than electrical issues..

When in doubt, Throttle her out...
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