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Battery Load Test #4539703
10/10/17 11:12 PM
10/10/17 11:12 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline OP
Merkava_4  Offline OP
Joined: Jan 2007
Posts: 17,501
Clovis, CA
If I pull the fuel pump relay and crank the starter, how much voltage should the battery have at that time ? Neighbor told me it should have at least 10.5 Volts while under load cranking the starter.

Re: Battery Load Test [Re: Merkava_4] #4539711
10/10/17 11:18 PM
10/10/17 11:18 PM
Joined: Jun 2003
Posts: 17,342
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,342
Deplorable in apple valley, ca
I was told 10.5v in autoshop.


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: Battery Load Test [Re: Chris142] #4539718
10/10/17 11:36 PM
10/10/17 11:36 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline OP
Merkava_4  Offline OP
Joined: Jan 2007
Posts: 17,501
Clovis, CA
I'll probably pick up a new battery tomorrow. Even though it takes a charge real easy, it immediately drops from 14.5 Volts to 12.2 Volts as soon as I shut the engine off. The battery still looks brand new. It's been living under the back seat for the last 12 years.

Re: Battery Load Test [Re: Merkava_4] #4539719
10/10/17 11:37 PM
10/10/17 11:37 PM
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
I never load my batteries unnecessarily, They generally give you ample warning before giving up on you on a regularly driven vehicle.....Like a slow start, Also watch for a lead/acid battery to "sweat" &/or "bulge".


Last edited by clinebarger; 10/10/17 11:44 PM.

2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: Battery Load Test [Re: Merkava_4] #4539732
10/11/17 12:09 AM
10/11/17 12:09 AM
Joined: Oct 2014
Posts: 3,893
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 3,893
Utah
Have you thought about something a little newer? Seems this vehicle is starting to give you issues.

Last edited by CKN; 10/11/17 12:11 AM.
Re: Battery Load Test [Re: CKN] #4539735
10/11/17 12:18 AM
10/11/17 12:18 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline OP
Merkava_4  Offline OP
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Originally Posted By: CKN
Have you thought about something a little newer? Seems this vehicle is starting to give you issues.


It's been the best car I've ever had in my life. It's like GM's version of the V6 Camry. No complaints.

Re: Battery Load Test [Re: CKN] #4539740
10/11/17 12:26 AM
10/11/17 12:26 AM
Joined: Oct 2012
Posts: 4,595
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,595
Taiwan
Originally Posted By: CKN
Have you thought about something a little newer? Seems this vehicle is starting to give you issues.


Yeh, something a little newer could never give issues. Certainly would never need a new battery.

My car needs a new battery, but then its 31 years old. What can you expect, eh?

Next thing I'll probably have to replace the contents of the fuel tank.

Nickle and dime, nickle and dime.

Last edited by Ducked; 10/11/17 12:27 AM.
Re: Battery Load Test [Re: Merkava_4] #4539748
10/11/17 01:18 AM
10/11/17 01:18 AM
Joined: Nov 2008
Posts: 9,033
Phoenix
dishdude Online content
dishdude  Online Content
Joined: Nov 2008
Posts: 9,033
Phoenix
Originally Posted By: Merkava_4
I'll probably pick up a new battery tomorrow. Even though it takes a charge real easy, it immediately drops from 14.5 Volts to 12.2 Volts as soon as I shut the engine off. The battery still looks brand new. It's been living under the back seat for the last 12 years.


The voltage drop doesn't sound that bad, but 12 years? It's time to start shopping for a new battery.


2018 Challenger SRT
Re: Battery Load Test [Re: Merkava_4] #4539752
10/11/17 01:34 AM
10/11/17 01:34 AM
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
Yeah time for a new battery


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Battery Load Test [Re: Merkava_4] #4539755
10/11/17 01:40 AM
10/11/17 01:40 AM
Joined: Mar 2015
Posts: 5,018
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,018
Virginia
Yeah like others have said... A battery 12 yrs old doesn't owe you anything really. Batteries stored away from the engine compartment really hold up much longer as evidenced by your experience.


Nissan Altima 3.5 Coupe
Quaker State High Mileage 5w30 Purolator Boss 14610
"Treat your family like your friends and treat your friends like your family."
Re: Battery Load Test [Re: Merkava_4] #4539794
10/11/17 05:39 AM
10/11/17 05:39 AM
Joined: Jul 2009
Posts: 596
texas
danez_yoda Offline
danez_yoda  Offline
Joined: Jul 2009
Posts: 596
texas
Batteries don't die like they used to. In the 80s and 90s you would get a few slow starts before the infamous "tick tick tick".

No they start fine then one day nothing. No dash lights no buzzer nada. Some wont even take a jump start.

My wifes 2004 camery did that to here. She drove to the store, it cranked fine when she came out the grocery store, 30 minutes later, battery dead as a door nail. This was 1 year in. Toyota replaced under warranty. 2 years later same thing happened at the day care.

Switched out for a Autozone Gold this time and it lasted 5 years but died the same way. No warning.

Re: Battery Load Test [Re: danez_yoda] #4539821
10/11/17 06:42 AM
10/11/17 06:42 AM
Joined: Jun 2006
Posts: 370
Texas
Neely97 Offline
Neely97  Offline
Joined: Jun 2006
Posts: 370
Texas
12 years, thatís got to be some sort of record.

I donít trust them after 36 months.


6.7 cummins, Toyota 4 runner
FUMOTO
Re: Battery Load Test [Re: Merkava_4] #4539886
10/11/17 07:53 AM
10/11/17 07:53 AM
Joined: Aug 2005
Posts: 905
dayton oh
kc8adu Offline
kc8adu  Offline
Joined: Aug 2005
Posts: 905
dayton oh
thats how the 12 year old diehard went in my f100.
just totally gone one morning.0v.
6 years of it with me and a 500w linear amp.
the replacement delco blew off a post after 1 week.and the exide lasted 6 months.
i got another diehard 27f and it left with the truck 6 more years later when i sold it.
just think if those diehards were mounted under the bed rather than under the hood with a 460!
and not being beat on with a demanding amplifier.

Re: Battery Load Test [Re: Merkava_4] #4539928
10/11/17 08:50 AM
10/11/17 08:50 AM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
New Jersey
1.75v/cell is standard. That's 10.5V.

Some can go to 1.67v/cell under load. That's 10V.

Re: Battery Load Test [Re: Merkava_4] #4539948
10/11/17 09:08 AM
10/11/17 09:08 AM
Joined: Aug 2008
Posts: 18,298
Ontario, Canada
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 18,298
Ontario, Canada
I have a monitor plugged into my cigarette lighter and the power isn't cut when it cranks over and it shows 10.5v while cranking and then immediately snaps back to 12ish and then the alternator kicks in.

I remember the good old days where you could put the headlights on and crank over and if the lights dimmed a lot or went out completely the battery was toast, not that it's all controlled to turn-off during cranking you can't use that as a quick diagnostic. frown


'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
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