Battery Dying - Automotive Repairs - Page 2 - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Do It Yourself > Automotive Repairs

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 07-21-2010, 05:13 PM   #16
Member
 
Join Date: Jul 2008
Location: NJ
Posts: 265
Rewards Points: 268
Default

battery dying


Quote:
Originally Posted by canadaclub View Post
Got a boost this morning and let it run for about 45 minutes. Then I went for a long drive, about an hour.

I put a meter between the neg side of the battery and the cable. It read 0 but flickered off and on with 1 miilliamp. I then did a voltage reading and got 12.97 vdc. I waited an hour and it read 12.54. Was enough to turn over the engine once but not enough to start. At least I had enough power to shut the window because its supposed to rain.

So, next I disconnect the neg terminal again and waited for 2 hours. Voltage now is 11.99vdc. I guess the battery is shot. Sheesh, I've only had it 6 months.

I also disconnected the red lead while the car was running and it continued to run so I assume the alternator works fine.



Sure appreciate the help folks. Tomorrow I'll take it in and get a replacement.
That's not a good way to test your charging system, and it doesn't indicate that the altenator that is not discharging the battery.

Advertisement

rustyjames is online now   Reply With Quote
Old 07-21-2010, 06:45 PM   #17
Handyman
 
Join Date: Oct 2006
Location: Oakville, Ont, Canada
Posts: 796
Rewards Points: 500
Default

battery dying


Hmmm...can you expand on that?
canadaclub is offline   Reply With Quote
Old 07-21-2010, 08:47 PM   #18
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

battery dying


I would not conclude that your battery is shot.

Do not disconnect the battery when the car is running.
Yoyizit is offline   Reply With Quote
Old 07-22-2010, 05:13 AM   #19
Member
 
Join Date: Jul 2008
Location: NJ
Posts: 265
Rewards Points: 268
Default

battery dying


Quote:
Originally Posted by canadaclub View Post
Hmmm...can you expand on that?
A bad diaode will allow it to charge, but drain the battery.
rustyjames is online now   Reply With Quote
Old 07-22-2010, 01:20 PM   #20
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 4,024
Rewards Points: 2,318
Default

battery dying


With the car turned off and everything on the car turned off, underhood light, trunk light, dome light, etc. Disconnect the hot cable, if it sparks, you have a short.
__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is online now   Reply With Quote
Old 07-22-2010, 01:35 PM   #21
Handyman
 
Join Date: Oct 2006
Location: Oakville, Ont, Canada
Posts: 796
Rewards Points: 500
Default

battery dying


Well, picked up a new battery today, swapped it out, and works like a charm. Thanks again all for the help
canadaclub is offline   Reply With Quote
Old 07-22-2010, 01:51 PM   #22
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

battery dying


So the old battery was sulphated?
Coulda' fooled me. Usually these crank the engine fast at first and then rapidly slow.
Yoyizit is offline   Reply With Quote
Old 07-23-2010, 10:59 PM   #23
Member
 
cowboy dan's Avatar
 
Join Date: Apr 2010
Posts: 77
Rewards Points: 75
Default

battery dying


Quote:
Originally Posted by canadaclub View Post
Well, picked up a new battery today, swapped it out, and works like a charm. Thanks again all for the help
with the new battery installed how does it charge now? i read that it was charging at 12.5v. is it still charging at 12.5? if it is your new battery will soon die. you ignition requires 12 by itself. you should have 14v charge and more on cold days. no less than 13.5 in order to use your accesories without putting too much load on the battery
cowboy dan is offline   Reply With Quote
Old 07-24-2010, 10:27 AM   #24
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 4,024
Rewards Points: 2,318
Default

battery dying


A voltmeter won't read correctly on a bad battery, so he original readings don't matter.
__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is online now   Reply With Quote
Old 07-24-2010, 07:55 PM   #25
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

battery dying


Quote:
Originally Posted by rusty baker View Post
A voltmeter won't read correctly on a bad battery, so he original readings don't matter.
Say what?
Yoyizit is offline   Reply With Quote
Old 07-24-2010, 08:17 PM   #26
Handyman
 
Join Date: Oct 2006
Location: Oakville, Ont, Canada
Posts: 796
Rewards Points: 500
Default

battery dying


Hmmm.I put a VM on a battery and you say its no good if its bad battery? Interesting. Then how would I know its a bad battery since the VM can't read voltage on a bad battery??
canadaclub is offline   Reply With Quote
Old 07-24-2010, 08:31 PM   #27
Handyman
 
Join Date: Oct 2006
Location: Oakville, Ont, Canada
Posts: 796
Rewards Points: 500
Default

battery dying


Quote:
Originally Posted by cowboy dan View Post
with the new battery installed how does it charge now? i read that it was charging at 12.5v. is it still charging at 12.5? if it is your new battery will soon die. you ignition requires 12 by itself. you should have 14v charge and more on cold days. no less than 13.5 in order to use your accesories without putting too much load on the battery
The new battery shows 14.3 volts. Starts like a charm. I can't tell how its charging because I only have an idiot light and no gauge.
canadaclub is offline   Reply With Quote
Old 07-24-2010, 08:37 PM   #28
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

battery dying


Quote:
Originally Posted by canadaclub View Post
The new battery shows 14.3 volts.
Then it's being charged. Anything above 12.8 means some current is flowing into the battery.

If the voltage stays at this value with the headlights and accessories being switched on and off then the regulator is also working.

You can also make an AC reading on your battery. Excessive AC ripple voltage means a problem in your alternator or high internal impedance in your battery.
The problem is, I don't know pass/fail limits or test conditions for this ripple voltage.

Last edited by Yoyizit; 07-24-2010 at 08:49 PM.
Yoyizit is offline   Reply With Quote
Old 07-24-2010, 10:19 PM   #29
Pro Flooring Installer
 
rusty baker's Avatar
 
Join Date: Feb 2009
Location: SW Missouri
Posts: 4,024
Rewards Points: 2,318
Default

battery dying


If you put a voltmeter on a battery in a running vehicle and it reads less than 14, It can be either a low battery or a faulty charging system. So it means nothing. If you know the battery is fully charged, and it reads less than 14, it is the charging system.

Advertisement

__________________
The ads in my post are there without my permission. I do not endorse any of the products.
Semi-Retired Installer
Installing since 1973
rusty baker is online now   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
APC Battery Backup - Extending Run Time with BIG Battery Bank homerb PC Repairs & Upgrades 31 05-03-2012 06:40 PM
Has anyone tried this way of fixing a dead cordless tool battery? BJLower Electrical 11 02-01-2010 02:31 PM
Old UPS to car battery? pcampbell Electrical 8 01-20-2009 06:34 PM
Milwaukee v28 Battery Life r62ewa Tools 12 12-04-2008 07:58 PM
Ryobi 12v battery system JElson Tools 3 10-11-2008 10:50 PM




Top of Page | View New Posts