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Did autozone test my batteries incorrectly? #4530648
09/30/17 08:24 PM
09/30/17 08:24 PM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
So I had some ac work done on my truck like a month or two ago and some genius didn't tighten one of my battery cables enough. Something still doesn't add up here though. The truck in my sig has two 850cc amp batteries and I would think it would still start off of one battery. All it did was click when I turned the key and I had to be jump started. Anyways, I got to thinking that since the batteries are wired up in parallel that you should unhook them and test them individually, which they didn't do.

Opinions? I'm glad my 1/0 gauge jumper cables finally came in handy.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530651
09/30/17 08:25 PM
09/30/17 08:25 PM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
I guess the question is how big of deal was it that they did it this way.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530652
09/30/17 08:29 PM
09/30/17 08:29 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
USA
I always test my batteries individually.

Did they perform a load test?

What were their test results?

Do you have a battery charger? If so then isolate each battery and fully charge. Then test.


Multiple Diesel and Gasoline vehicles
Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530655
09/30/17 08:30 PM
09/30/17 08:30 PM
Joined: Apr 2016
Posts: 965
KS
FordBroncoVWJeta Offline
FordBroncoVWJeta  Offline
Joined: Apr 2016
Posts: 965
KS
They should have tested the batteries one at a time. One battery could be going bad and discharging killing the other one.


2017 Volkswagen Jetta 1.4T - 2015 Honda CRV 2.4 - 2012 Volkswagen Jetta 2.0 - 2001 Pontiac Sunfire 2.2
Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530656
09/30/17 08:30 PM
09/30/17 08:30 PM
Joined: Aug 2017
Posts: 663
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 663
MN
They should always be tested individually.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530658
09/30/17 08:31 PM
09/30/17 08:31 PM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
Yeah they load tested them and both came out fine and also tested the alternator too.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530659
09/30/17 08:34 PM
09/30/17 08:34 PM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
Last time my batteries were going bad the guy just gave me new ones. They couldn't even get the tester to work at first.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530706
09/30/17 09:44 PM
09/30/17 09:44 PM
Joined: Sep 2007
Posts: 1,022
TX, USA
JMJNet Offline
JMJNet  Offline
Joined: Sep 2007
Posts: 1,022
TX, USA
How old is the batteries?
Usually, they last around 3-4 years.

Do yourself a favor, go to Harbor Freight and buy a battery load tester around $20.
It should help you determine if you need to change your batteries or not.
Doing it yourself, you should take the time to do it right like one battery at a time.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Did autozone test my batteries incorrectly? [Re: JMJNet] #4530709
09/30/17 09:46 PM
09/30/17 09:46 PM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
Originally Posted By: JMJNet
How old is the batteries?
Usually, they last around 3-4 years.

Do yourself a favor, go to Harbor Freight and buy a battery load tester around $20.
It should help you determine if you need to change your batteries or not.
Doing it yourself, you should take the time to do it right like one battery at a time.


I won't load test a battery. One almost blew up on me one time and I promised never again.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530710
09/30/17 09:47 PM
09/30/17 09:47 PM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
You haven't lived until you see smoke coming from a battery.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530808
10/01/17 01:22 AM
10/01/17 01:22 AM
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
If they truly are parallel connected lead-acids (without a dual battery isolator) then the cells have to match in voltage and essentially condition overall. If not (for example one battery in poorer shape than the other) then the bad battery will drain the good one until the voltages match (which might be too little to start the vehicle).

If you have an isolator then the vehicle will charge them individually and the start battery will get priority. A good isolator should allow you to switch both in parallel for starting for extra current. Don't forget to switch back to isolated after the start.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530815
10/01/17 01:42 AM
10/01/17 01:42 AM
Joined: Aug 2006
Posts: 9,883
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,883
Central Washington
Originally Posted By: motor_oil_madman
You haven't lived until you see smoke coming from a battery.




On these I prefer to take the negative cable off one and test individually if possible. Dual 850s usually will say good on a conductance tester even if one is marginal Ive noticed. Maybe the newer ones are better than my old model but I'd think it would give a better idea of how each one is working if you split it.
Whats nice is the out-of-vehicle testing mode is more accurate and faster too, so if I want to get really in depth, Id pull the negative off one battery, test it, reinstall and then do the same on the other one.
Then none of the electronics lose power during testing either.

Last edited by Colt45ws; 10/01/17 01:46 AM.

-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: Did autozone test my batteries incorrectly? [Re: Johnny2Bad] #4530857
10/01/17 04:32 AM
10/01/17 04:32 AM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
USA
Originally Posted By: Johnny2Bad
If they truly are parallel connected lead-acids (without a dual battery isolator) then the cells have to match in voltage and essentially condition overall. If not (for example one battery in poorer shape than the other) then the bad battery will drain the good one until the voltages match (which might be too little to start the vehicle).

If you have an isolator then the vehicle will charge them individually and the start battery will get priority. A good isolator should allow you to switch both in parallel for starting for extra current. Don't forget to switch back to isolated after the start.


Dpesn't his diesel already use both batteries to start the vehicle? He does not have an isolator from the factory and very few diesel pickups ever do. Its just a dual battery system and both are always functioning together.

Good you mention they need to work together and be in similar condition. They should be replaced together even if only one is faulty and hopefully with an identical product.


Multiple Diesel and Gasoline vehicles
Re: Did autozone test my batteries incorrectly? [Re: motor_oil_madman] #4530909
10/01/17 07:20 AM
10/01/17 07:20 AM
Joined: Sep 2007
Posts: 346
northern NY
Driz Offline
Driz  Offline
Joined: Sep 2007
Posts: 346
northern NY
Get a battery load tester . You're always going to need one anyways. Amazon, under $20. It's one of those gotta have tools for anybody who does their own work.

Re: Did autozone test my batteries incorrectly? [Re: Johnny2Bad] #4530962
10/01/17 08:11 AM
10/01/17 08:11 AM
Joined: Nov 2009
Posts: 5,123
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,123
Houston, Texas
Originally Posted By: Johnny2Bad
If they truly are parallel connected lead-acids (without a dual battery isolator) then the cells have to match in voltage and essentially condition overall. If not (for example one battery in poorer shape than the other) then the bad battery will drain the good one until the voltages match (which might be too little to start the vehicle).

If you have an isolator then the vehicle will charge them individually and the start battery will get priority. A good isolator should allow you to switch both in parallel for starting for extra current. Don't forget to switch back to isolated after the start.



I guess that explains it then. The battery with the loose cable must have lost charge long enough and then caused it to bring the other battery down with it.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

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