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Ask ALDeer Jeep Question alternator won’t charge #3802662
12/03/22 03:30 PM
12/03/22 03:30 PM
Joined: Jun 2008
Posts: 2,384
North Alabama
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robinhedd Offline OP
8 point
robinhedd  Offline OP
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Posts: 2,384
North Alabama
I bought a 2006 Jeep Wrangler, ran great during the test drive, zero issues. Driving it home, the transmission wouldn’t shift (because the battery was dying) and the engine eventually went dead. It had a dead battery. I figured out the new alternator wasn’t charging at all. I exchanged the alternator for a new one, replaced it on the Jeep. It showed to be charging on the gage for about 5 minutes, then the gage hand went down and the Jeep went dead again.

The alternator is just not charging, what do you say? Could I have another bad alternator? Or some other problem? Thanks in advance, Robinhedd

Last edited by robinhedd; 12/03/22 03:36 PM.

"Guess I just got too much Mathews in me!"
Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3802743
12/03/22 04:36 PM
12/03/22 04:36 PM
Joined: Jan 2002
Posts: 11,893
Saraland, Alabama
hammerhead Offline
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Saraland, Alabama

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3804752
12/05/22 09:38 PM
12/05/22 09:38 PM
Joined: Jun 2008
Posts: 2,384
North Alabama
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robinhedd Offline OP
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robinhedd  Offline OP
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Anyone else with real Jeep experience?


"Guess I just got too much Mathews in me!"
Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3804783
12/05/22 09:52 PM
12/05/22 09:52 PM
Joined: Nov 2012
Posts: 10,108
Northport, Al.
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It's not uncommon to buy new alternators to only install them and find out they too are bad.

Best thing is to not trust the gauge, but put your volt meter on it and see what you are reading with the engine running.

God Bless,
David B.


Premium member #8925
Team Rack Addicts
2016 Aldeer Deer Champions

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3804821
12/05/22 10:24 PM
12/05/22 10:24 PM
Joined: Oct 2022
Posts: 2,270
NOALA
RidgeRanger Online happy
8 point
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NOALA
How old is the battery? If the battery is internally shorted, it could be drawing enough amps to toast the alternator diodes. Any corrosion on the positive leads to the battery? That could be another source of excessive amp draw on the alternator.

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: RidgeRanger] #3806347
12/07/22 11:17 AM
12/07/22 11:17 AM
Joined: Jun 2008
Posts: 2,384
North Alabama
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robinhedd Offline OP
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robinhedd  Offline OP
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Originally Posted by RidgeRanger
How old is the battery? If the battery is internally shorted, it could be drawing enough amps to toast the alternator diodes. Any corrosion on the positive leads to the battery? That could be another source of excessive amp draw on the alternator.


The battery charges good, but doesn’t last very long either.I think maybe I could take the battery and the alternator to O’Reilly auto parts and have them checked. Thanks, Robinhedd


"Guess I just got too much Mathews in me!"
Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3806349
12/07/22 11:19 AM
12/07/22 11:19 AM
Joined: Sep 2007
Posts: 1,669
gardendale, al
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mrinfo Offline
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gardendale, al
Yep, oreillys tested the alternator on my daughters 07 jeep and it was bad. Thats a quick and easy replacement.

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3806849
12/07/22 07:47 PM
12/07/22 07:47 PM
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Posts: 2,384
North Alabama
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robinhedd Offline OP
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robinhedd  Offline OP
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Also found out the alternator actually charges through the gage:


"Guess I just got too much Mathews in me!"
Re: Ask ALDeer Jeep Question alternator won’t charge [Re: BOFF] #3806869
12/07/22 08:01 PM
12/07/22 08:01 PM
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Posts: 10,552
Alabama
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Originally Posted by BOFF
It's not uncommon to buy new alternators to only install them and find out they too are bad.

Best thing is to not trust the gauge, but put your volt meter on it and see what you are reading with the engine running.

God Bless,
David B.

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3806941
12/07/22 09:11 PM
12/07/22 09:11 PM
Joined: Jan 2014
Posts: 2,470
Highland Home, Al
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Squadron77 Offline
10 point
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Highland Home, Al
You will lose over 1 volt between the alt and battery with good cables and with bad cables more. All newer alt have a remote sensor that runs to the battery so the alt will put out the full 14 volts to the battery. Most people will not hook these up so check your alt and see it you have a post with nothing connected. Always disconnect the battery when replacing the alt because any arc on the cable will fry the alt.

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3807624
12/08/22 06:32 PM
12/08/22 06:32 PM
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North Alabama
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robinhedd Offline OP
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Well, I took the alternator off today, went to Oreiley’s and had it tested. The alternator tested good and the battery tested good. What should I check next?


"Guess I just got too much Mathews in me!"
Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3807671
12/08/22 07:20 PM
12/08/22 07:20 PM
Joined: Mar 2013
Posts: 47
Hurricane Creek Alabama
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Hurricane Creek Alabama
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Re: Ask ALDeer Jeep Question alternator won’t charge [Re: robinhedd] #3807680
12/08/22 07:28 PM
12/08/22 07:28 PM
Joined: Nov 2012
Posts: 10,108
Northport, Al.
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Originally Posted by robinhedd
Well, I took the alternator off today, went to Oreiley’s and had it tested. The alternator tested good and the battery tested good. What should I check next?


Did they put a load on the battery to test it?


God Bless,
David B.


Premium member #8925
Team Rack Addicts
2016 Aldeer Deer Champions

Re: Ask ALDeer Jeep Question alternator won’t charge [Re: BOFF] #3807813
12/08/22 09:43 PM
12/08/22 09:43 PM
Joined: Jun 2008
Posts: 2,384
North Alabama
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robinhedd Offline OP
8 point
robinhedd  Offline OP
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North Alabama
Originally Posted by BOFF
Originally Posted by robinhedd
Well, I took the alternator off today, went to Oreiley’s and had it tested. The alternator tested good and the battery tested good. What should I check next?


Did they put a load on the battery to test it?


God Bless,
David B.


I’m not sure David, they tested the battery @ O’reilley’s, I had it fully charged before I took it up there. Thanks, Robinhedd


"Guess I just got too much Mathews in me!"

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