Charging Voltage
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 7 of 7
Cadillac Seville / Cadillac Eldorado Forum Discussion, Charging Voltage in Past Cadillac Vehicle Discussion; Hello everyone, I noticed today my 2002 Eldorado ETC wouldnt start, so I gave it a jump. It then started ...
  1. #1
    SamarthVader is offline Cadillac Owners Member
    Automobile(s): 1992 Seville, 2002 Eldorado ETC
    Join Date
    Nov 2011
    Location
    Worldwide
    Age
    23
    Posts
    51

    Charging Voltage

    Hello everyone,

    I noticed today my 2002 Eldorado ETC wouldnt start, so I gave it a jump. It then started and ran fine. I noticed the voltage reading start at 13.0 when I started the car and rose to a steady 13.5 driving around. When I got my new battery a year ago I recall the charging voltage being 14.0 - 14.5 volts. Is my alternator going bad? What exactly is the normal range for charging voltage?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Location
    Atlanta area
    Posts
    4,720

    Re: Charging Voltage

    Quote Originally Posted by SamarthVader View Post
    ....What exactly is the normal range for charging voltage?
    Your normal is what you experience.

    There is no definitive answer to your question; too many variables involved in the charging process.

    Your battery has failed to crank the engine; that might be the only early warning you receive about battery condition. Battery condition is not related to battery age. As a starting point, have the battery load tested; worry about charging voltage later.

  4. #3
    SamarthVader is offline Cadillac Owners Member
    Automobile(s): 1992 Seville, 2002 Eldorado ETC
    Join Date
    Nov 2011
    Location
    Worldwide
    Age
    23
    Posts
    51

    Re: Charging Voltage

    Thanks for the response. I also noticed the instant mpg reading is bouncing all over the place. Holding a steady 40 mph it jumps from 15 mpg to 50 mpg. Is this a related issue? It was working fine before the battery was discharged.

  5. #4
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Location
    Atlanta area
    Posts
    4,720

    Re: Charging Voltage

    Quote Originally Posted by SamarthVader View Post
    Thanks for the response. I also noticed the instant mpg reading is bouncing all over the place. Holding a steady 40 mph it jumps from 15 mpg to 50 mpg. Is this a related issue? It was working fine before the battery was discharged.
    Focus, focus, focus.

    Load test the battery!!

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    44,702

    Re: Charging Voltage

    As posted, load test the battery - you can't start with damaged goods .............

    I have beat my keyboard to death trying to get across the fact that automotive lead-acid and "maintenance free" battery charging voltages are normally somewhat elevated above the nominal "12 volt battery" full-charge 12.6 volts.

    Read it from somewhere else - and the list of links is endless - Google and study wet cell battery and charging theory and learn something.

    http://www.landiss.com/battery.htm

  7. #6
    SamarthVader is offline Cadillac Owners Member
    Automobile(s): 1992 Seville, 2002 Eldorado ETC
    Join Date
    Nov 2011
    Location
    Worldwide
    Age
    23
    Posts
    51

    Re: Charging Voltage

    How long should I wait after the battery is charged to test it?

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,498

    Re: Charging Voltage

    It doesn't matter on a load test.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting