User Tag List

Results 1 to 10 of 10

Thread: Charging Problem HELP!!!

  1. #1
    Oh, the possibilities! njmmarines's Avatar
    Join Date
    Aug 2008
    Location
    Dundee
    Posts
    16

    Branch
    Marine Corps
    Status
    Serving
    Served
    2005 to 2010

    Closest Installation

    Camp Pendleton
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Angry Charging Problem HELP!!!

    So I have a '97 Wrangler 4.0L, my alternator went bad a couple weeks ago so I replaced it. My battery is fine. But I am only getting about 12.3 volts out of the alternator, I had the new one bench tested and it is fine. Apperently it is not charging at low RPM's. I am thinking the voltage regulator has gone bad and have heard that the regulator is in the ECU...? Anyone have any suggestions or have you had this problem in the past? Thanks!

  2. #2
    Devil Doc Navydoc8778's Avatar
    Join Date
    May 2009
    Location
    Bozeman
    Posts
    2,768

    Branch
    Navy
    Status
    Serving
    Served
    2000 to 2014

    Closest Installation

    Malmstrom AFB
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Where is Dundee? Do you have a vatozone anywhere near you?

  3. #3
    Oh, the possibilities! njmmarines's Avatar
    Join Date
    Aug 2008
    Location
    Dundee
    Posts
    16

    Branch
    Marine Corps
    Status
    Serving
    Served
    2005 to 2010

    Closest Installation

    Camp Pendleton
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    It's in Oregon. I went in there and they plugged their maching into it and the altornator is fine as well as the battery, and that it is low output at idle.

  4. #4
    Free at last... ColoFreeJeeper's Avatar
    Join Date
    Dec 2008
    Location
    Colorado Springs
    Posts
    5,719

    Branch
    Army
    Status
    Served
    Served
    2004 to 2009

    Closest Installation

    Fort Carson
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)

    Default

    Sounds like your ECU.

  5. #5
    Member 19delta's Avatar
    Join Date
    May 2010
    Location
    riverton
    Posts
    552

    Branch
    Army
    Status
    Served
    Served
    2001 to 2002

    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)

    Default

    to be sure put a voltmeter on you altenator, then trace back for there, either useing volts(with battery) or ohms(withought battery). though honestly i would try to ohm it out first, just in case you have a ground that can be causing the problem
    "If you don't stand for something, you'll fall for anything"
    quote from movie "sucker punch"

  6. #6
    Time n Money Ghost00TJ's Avatar
    Join Date
    May 2008
    Location
    Missouri
    Posts
    9,121

    Branch
    Army
    Status
    Retired
    Served
    1986 to 2008

    Closest Installation

    Fort Leonard Wood
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)

    Default

    I was thinking grounds, should be 2 real easy to get to one to the block and the other to the firewall both going to battery. Also the positive cables if they are worn enough can cause charging issues.
    F'it, aint my Jeep!
    Beer does a Jeep Good

  7. #7
    Senior Member SavageSun4x4's Avatar
    Join Date
    Jun 2010
    Location
    17 Oaks Ranch, Boerne, Texas
    Posts
    2,373

    Branch
    Army
    Status
    Retired
    Served
    1967 to 1994

    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by Ghost00TJ View Post
    I was thinking grounds, should be 2 real easy to get to one to the block and the other to the firewall both going to battery. Also the positive cables if they are worn enough can cause charging issues.
    X2

    If the Alt spec's out good and you are getting low voltage at the cables, then insure your battery clamps are clean. Clean them and then check voltage and if you are not getting a good reading then replace the cables.

    Here are some tips on taking care of your cables. http://www.militaryjeepers.com/commu...888#post268888
    Don

    '15 Jeep Unlimited Rubicon Hard Rock...OLD SCHOOL 6 Spd Manual Trans
    17 Oaks Ranch Companies LLC

    www.savagesun4x4.com

  8. #8
    Junior Member Scottieam's Avatar
    Join Date
    Feb 2011
    Location
    Fort Carson
    Posts
    305

    Branch
    Army
    Status
    Serving
    Served
    2008 to Present

    Closest Installation

    Fort Carson
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default

    I second SavageSun's directions... Pay close attention to the small charging wire coming of the back of the alt... I had an issue after I had my custom spun alt. put it, and it ended up being, that little wire was in rough shape... R&R's with bigger, better quality wire...

  9. #9
    Jeepless Jeeper brewcoltiii's Avatar
    Join Date
    Jun 2010
    Location
    Molalla
    Posts
    1,082

    Branch
    Army National Guard
    Status
    Serving
    Served
    1992 to Present

    Closest Installation

    Fort Lewis
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by Scottieam View Post
    I second SavageSun's directions... Pay close attention to the small charging wire coming of the back of the alt... I had an issue after I had my custom spun alt. put it, and it ended up being, that little wire was in rough shape... R&R's with bigger, better quality wire...
    The same thing on a Jimmy that I just replaced the alternator and battery on. The cable was corroded.

  10. #10
    Senior Member SavageSun4x4's Avatar
    Join Date
    Jun 2010
    Location
    17 Oaks Ranch, Boerne, Texas
    Posts
    2,373

    Branch
    Army
    Status
    Retired
    Served
    1967 to 1994

    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default

    Electricity flows on the outside of the cables, that is why I used welding grade cabling, finer wires more capacity for the same size gauge wiring. So what is the difference between welding grade and auto grade other than welding has finer wire. The sheathing on auto grade withstands higher temps. This is NOT to say that welding wire is a piker in the temp dept. Don't have any cable laying in front of me, but suffice to say it will handle the under-hood temps of any auto. + welding grade by nature of finer wires is also much more flexible.

    That said, as the body electric flows on the outside of the copper cable itself and is inside a sheath that is flexing around, fumes from the battery (and they all give all some fumes) start the corrosion process at the terminal and it has a tendency to travel the length of the cable itself over time. BUT we cannot see it. SO time takes its toll and sooner or later the cable begins to fail INTERNALLY.

    I make HD cables using solid copper and solid copper w/silver plating, all soldered connections and I use 1 ga welding grade wire. I can show you have to make your own and if you want pics of the individual pieces I use I can add those. I only charge about $20 a set , but shipping would be pricey as they are heavy and YOU can do this yourself...

    Let me know if you want more help or pics...
    Don

    '15 Jeep Unlimited Rubicon Hard Rock...OLD SCHOOL 6 Spd Manual Trans
    17 Oaks Ranch Companies LLC

    www.savagesun4x4.com

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the MJ Supporter Membership for a little less than $0.06 a day and get more space, 2 MJ Stickers and no banners ads. [Check it out]