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#4785038 - 06/12/18 04:42 PM AZ Reman Alternator rarely pulls more than 14.0v
ThunderOne Offline


Registered: 05/29/18
Posts: 42
Loc: USA
Hello all,

I just recently had to swap my alternator due to mud failure (again), and the "new" (free replacement) one I put in seems to make a noisy bearing noise. On top of that, it seems to never want to output more than 13.7volts (14.0 is just about the highest I've ever seen it go). It will sometimes drop to 13.2 or 13.3. I am not sure if this is a lemon, or if my battery is old. The battery seems to hold a resting voltage just fine, and has about 535 CCA out of the original 725CCA.. maybe not the best measurement but the shop tested it this way and said I needed to replace it. I am skeptical of this.

My previous alternator was putting out 14.3 volts in normal conditions.

Just wondering if this alternator is a lemon or if the battery isn't accepting a higher voltage anymore. I have an OEM spare with low-ish miles on it and was thinking of swapping in my free time to see if maybe the noisy bearing sounds will go away. The truck just recently had all other pulleys replaced (new compressor, idler, fan bearing). Only other possibility is a noisy power steering pulley but the noise doesn't come from that side of the engine bay.


Edited by ThunderOne (06/12/18 04:44 PM)

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#4785043 - 06/12/18 04:50 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
Panos Offline


Registered: 12/08/16
Posts: 68
Loc: Greece
I don't think an old battery can lower the system voltage. Mine has always been 14,3 volts regardless of the battery age.
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#4785058 - 06/12/18 05:01 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Panos]
ThunderOne Offline


Registered: 05/29/18
Posts: 42
Loc: USA
Originally Posted By: Panos
I don't think an old battery can lower the system voltage. Mine has always been 14,3 volts regardless of the battery age.
so it would be safe to say I got a dud?

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#4785070 - 06/12/18 05:15 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Panos]
Propflux01 Offline


Registered: 09/26/02
Posts: 3430
Loc: Arkansastan
Originally Posted By: Panos
I don't think an old battery can lower the system voltage. Mine has always been 14,3 volts regardless of the battery age.


I would disagree. I have had bad batteries take out an alternator. Like the OP, his battery checks only about 2/3 capacity. Even if it shows proper voltage statically, I am willing to bet if he turns ignition to "on", but leaves engine off, turns on headlights, and blower, his voltage on the battery will be lower than 11 volts. Usually batteries like this overheat the stator and/or regulator portion on the alternator. The lower output is the result. Battery age is inconsequential to condition. You can have an old battery keep its capacity, or a newer one take a dump out of thin air. I'd replace the battery and go from there. It sounds like its about gone anyhow.
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#4785129 - 06/12/18 06:05 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
Donald Online   content


Registered: 03/21/04
Posts: 20677
Loc: Upstate NY
I think you got another dude. I suggest you get a known brand from RockAuto. Better is a local starter rebuilder if you can find one.

Your alternator has a full wave bridge for 3 phase AC. Converts it to DC. The good rebuilders replace the bridge. The third world rebuilders solder in new diodes to replace the broken ones.
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#4785157 - 06/12/18 06:44 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
Chris142 Offline


Registered: 06/05/03
Posts: 17151
Loc: Deplorable in apple valley, ca
Your battery is bad! You cant diagnose any electrical problems with a bad battery.
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#4785188 - 06/12/18 07:13 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
Linctex Offline


Registered: 12/31/16
Posts: 6189
Loc: Waco, TX
I have started vehicles on a good battery, swapped one in that was dead (yes, while running) and immediately drove 6 hours.

I have NEVER, ever heard of a bad battery making an alternator work harder.

I think you have a bad alternator.
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#4785206 - 06/12/18 07:41 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
Audios Offline


Registered: 11/19/11
Posts: 1008
Loc: Lyndhurst NJ
Load the system up before you do the voltage test, defroster on front and back, headlights, wipers, radio etc. See if its below 13.6 or so, if so its weak. Also check resting voltage on the battery, 12.3 is considered a decent number, but much below that it should be either recharged and tested or replaced.
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#4785245 - 06/12/18 08:33 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Linctex]
Propflux01 Offline


Registered: 09/26/02
Posts: 3430
Loc: Arkansastan
Originally Posted By: Linctex
I have started vehicles on a good battery, swapped one in that was dead (yes, while running) and immediately drove 6 hours.

I have NEVER, ever heard of a bad battery making an alternator work harder.

I think you have a bad alternator.


https://mechanics.stackexchange.com/questions/27815/can-a-weak-battery-destroy-an-alternator
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#4785251 - 06/12/18 08:42 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Linctex]
madeej11 Offline


Registered: 06/22/15
Posts: 139
Loc: montreal ,canada
Hey Linctex, maybe I'm a little lost on this but why would you put a dead battery in a car and then go and drive 6 hours with it. What's the reason ? Thanks.

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#4785274 - 06/12/18 09:18 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Propflux01]
bbhero Offline


Registered: 03/20/15
Posts: 4842
Loc: Virginia
Great information/link.

I've noticed in the lady's Camry that it would drop down in headlights, display, and fans when the old battery was in it and the car idled. If you went down the road everything lite right back up to normal. Got a new battery and that disappeared. Everything stayed the same whether at idle or going down the road.


Edited by bbhero (06/12/18 09:34 PM)
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#4785620 - 06/13/18 08:43 AM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
ThunderOne Offline


Registered: 05/29/18
Posts: 42
Loc: USA
I'm getting conflicting answers... I will go ahead and swap in the other alternator and see what the output is. If it's better (and quieter to boot... because the bearings are better), I'll assume the alternator was bad.

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#4786165 - 06/13/18 07:24 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
mjoekingz28 Offline


Registered: 11/21/07
Posts: 3996
Loc: United States of America
Does an alternator have some sort of clutch like a driven fan does? I mean, the alternator has to know when to charge by resistance and when to freewheel.

So, if so, then maybe the alt is getting burned out by always being in charge mode since the battery and maybe the wiring are not up to par.

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#4786249 - 06/13/18 09:13 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne]
Propflux01 Offline


Registered: 09/26/02
Posts: 3430
Loc: Arkansastan
Please let us know what the result is.
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2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"

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#4786721 - 06/14/18 02:10 PM Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Propflux01]
joel95ex Offline


Registered: 02/05/08
Posts: 652
Loc: texas
the AZ alternators i had were HORRIBLE. one died in less than a month. went through all the checks and after the 3rd or 4th "free replacement" i got my money back and went and bought one at advance auto which outlasted all of the AZ remans combined. that was on my accord.
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