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AZ Reman Alternator rarely pulls more than 14.0v #4785038
06/12/18 04:42 PM
06/12/18 04:42 PM
Joined: May 2018
Posts: 42
USA
ThunderOne Offline OP
ThunderOne  Offline OP
Joined: May 2018
Posts: 42
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.

Last edited by ThunderOne; 06/12/18 04:44 PM.
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4785043
06/12/18 04:50 PM
06/12/18 04:50 PM
Joined: Dec 2016
Posts: 72
Greece
Panos Offline
Panos  Offline
Joined: Dec 2016
Posts: 72
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.


Ford fiesta 1.6 mk6 Motul specific 913D/Motul Gear 300
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Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Panos] #4785058
06/12/18 05:01 PM
06/12/18 05:01 PM
Joined: May 2018
Posts: 42
USA
ThunderOne Offline OP
ThunderOne  Offline OP
Joined: May 2018
Posts: 42
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?

Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Panos] #4785070
06/12/18 05:15 PM
06/12/18 05:15 PM
Joined: Sep 2002
Posts: 3,454
Arkansastan
Propflux01 Offline
Propflux01  Offline
Joined: Sep 2002
Posts: 3,454
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.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4785129
06/12/18 06:05 PM
06/12/18 06:05 PM
Joined: Mar 2004
Posts: 20,828
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,828
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.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4785157
06/12/18 06:44 PM
06/12/18 06:44 PM
Joined: Jun 2003
Posts: 17,493
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,493
Deplorable in apple valley, ca
Your battery is bad! You cant diagnose any electrical problems with a bad battery.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4785188
06/12/18 07:13 PM
06/12/18 07:13 PM
Joined: Dec 2016
Posts: 6,466
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,466
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.


"The evidence demands a verdict".
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Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4785206
06/12/18 07:41 PM
06/12/18 07:41 PM
Joined: Nov 2011
Posts: 1,111
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,111
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.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Linctex] #4785245
06/12/18 08:33 PM
06/12/18 08:33 PM
Joined: Sep 2002
Posts: 3,454
Arkansastan
Propflux01 Offline
Propflux01  Offline
Joined: Sep 2002
Posts: 3,454
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


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Linctex] #4785251
06/12/18 08:42 PM
06/12/18 08:42 PM
Joined: Jun 2015
Posts: 196
montreal ,canada
madeej11 Offline
madeej11  Offline
Joined: Jun 2015
Posts: 196
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.

Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Propflux01] #4785274
06/12/18 09:18 PM
06/12/18 09:18 PM
Joined: Mar 2015
Posts: 5,103
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,103
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.

Last edited by bbhero; 06/12/18 09:34 PM.

Nissan Altima 3.5 Coupe
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Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4785620
06/13/18 08:43 AM
06/13/18 08:43 AM
Joined: May 2018
Posts: 42
USA
ThunderOne Offline OP
ThunderOne  Offline OP
Joined: May 2018
Posts: 42
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.

Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4786165
06/13/18 07:24 PM
06/13/18 07:24 PM
Joined: Nov 2007
Posts: 3,996
United States of America
mjoekingz28 Offline
mjoekingz28  Offline
Joined: Nov 2007
Posts: 3,996
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.

Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: ThunderOne] #4786249
06/13/18 09:13 PM
06/13/18 09:13 PM
Joined: Sep 2002
Posts: 3,454
Arkansastan
Propflux01 Offline
Propflux01  Offline
Joined: Sep 2002
Posts: 3,454
Arkansastan
Please let us know what the result is.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: AZ Reman Alternator rarely pulls more than 14.0v [Re: Propflux01] #4786721
06/14/18 02:10 PM
06/14/18 02:10 PM
Joined: Feb 2008
Posts: 655
texas
joel95ex Offline
joel95ex  Offline
Joined: Feb 2008
Posts: 655
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.


95 Accord 4cyl Vtec. 500,000+miles. RIP 😢
2013 sonata 117k miles
PP, QSUD,10w-30 fram ultra filter
07 civic SI 132k miles PP, M1 10w-30 fram ultra
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