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Old 09-15-2013, 04:55 PM
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Originally Posted by odgreen89on35s

Get a battery charger on the battery
Put it on the charger for 4 hours and everything is fine now.... why didn't my alternator bring it back to a full charge?
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Old 09-15-2013, 04:56 PM
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Originally Posted by codykrr
ok so today I finished cleaning up the jeep a bit. took it out for a drive enjoying the day. I noticed this super high piched whine when I throttle. I mean like dog whistle time whine. but only at a certain point then when I would increases the throttle it went away back to a coast and it comes back. almost like a ringing of the ears noise... any idea what could cause it? I cant seem to pin point the noise.
Do you have an aftermarket stereo or amps?
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Old 09-15-2013, 05:06 PM
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Originally Posted by codykrr
ok so today I finished cleaning up the jeep a bit. took it out for a drive enjoying the day. I noticed this super high piched whine when I throttle. I mean like dog whistle time whine. but only at a certain point then when I would increases the throttle it went away back to a coast and it comes back. almost like a ringing of the ears noise... any idea what could cause it? I cant seem to pin point the noise.
Possible vacuum leak at the engine.
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Old 09-15-2013, 05:47 PM
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Originally Posted by KG8893
Put it on the charger for 4 hours and everything is fine now.... why didn't my alternator bring it back to a full charge?
Your alt has to see a certain voltage to kick on.
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Old 09-15-2013, 06:18 PM
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Originally Posted by KG8893
Put it on the charger for 4 hours and everything is fine now.... why didn't my alternator bring it back to a full charge?
Possibly bad connectors. Make sure your voltage is roughly 14.25V when engine is running. If it is around 12 ish, it means your alternator is either not charging or there is a bad connection somewhere.
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Old 09-15-2013, 06:30 PM
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Originally Posted by karl4x4

Possibly bad connectors. Make sure your voltage is roughly 14.25V when engine is running. If it is around 12 ish, it means your alternator is either not charging or there is a bad connection somewhere.
My alternator puts out 13.75 when tested at the battery. Its a 117amp alternator
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Old 09-15-2013, 06:36 PM
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Originally Posted by KG8893

Put it on the charger for 4 hours and everything is fine now.... why didn't my alternator bring it back to a full charge?
Also, when waa the last time you brass brush cleaned the terminals and put di electric on em.
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Old 09-15-2013, 07:27 PM
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Originally Posted by karl4x4

Possibly bad connectors. Make sure your voltage is roughly 14.25V when engine is running. If it is around 12 ish, it means your alternator is either not charging or there is a bad connection somewhere.
It is now just a hair over 14 (14.2) on the dash but last night it was reading 12 on the dash, and yes the voltage meter on the dash is accurate.

Originally Posted by bulrid8

Your alt has to see a certain voltage to kick on.
I've never heard of a car that needed to have the battery recharged separate of the alternator if it dies. That's the point of the alternator. and I've killed the Jeeps battery several times in the past and not had the same problem.
Last edited by KG8893; 09-15-2013 at 07:29 PM.
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Old 09-15-2013, 07:29 PM
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Alternators keep a battery charged under normal useage. They're not battery chargers.

Also, your battery may be getting weak?
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Old 09-15-2013, 07:31 PM
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Originally Posted by cruiser54
Alternators keep a battery charged under normal useage. They're not battery chargers.

Also, your battery may be getting weak?
Battery is less than a year old. About 9 months. And it charged up fine.

Edit... charged up fine with the charger.

Also like I said... if the alternator couldn't charge the battery back up they would never have invented jumper cables cause they wouldn't work.
Last edited by KG8893; 09-15-2013 at 07:33 PM.
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Old 09-15-2013, 07:32 PM
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Originally Posted by sycoglitch

Also, when waa the last time you brass brush cleaned the terminals and put di electric on em.
Recently cleaned, never put grease on, never seen corrosion on my battery or terminals.
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Old 09-15-2013, 07:33 PM
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Well, some of this new fangled stuff, ya know. Voltage regulator in the PCM, relearning in the PCM after a dead battery.
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Old 09-15-2013, 07:37 PM
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Originally Posted by cruiser54
Well, some of this new fangled stuff, ya know. Voltage regulator in the PCM, relearning in the PCM after a dead battery.
That was my original issue. I haven't had it happen in a long time though, even after I recently had the battery out for 2 weeks.

I've always been able to just drive away and have the jeep run fine once I get it jumped. The alternator has always CHARGED my battery fine.
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Old 09-15-2013, 07:41 PM
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Don't know what to tell ya then.
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Old 09-15-2013, 07:47 PM
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Originally Posted by cruiser54
Don't know what to tell ya then.
Hope someone else has an idea... like I said it's running fine now and charging fine... but I would hate to kill my battery out on the trail and have it do this...
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