Help Support Ram Forum by donating:


Battery not charging - new alternator and battery

Discussion in 'Audio & Electronics' started by luigi38, Mar 2, 2014.

  1. luigi38

    luigi38 Junior Member

    Posts:
    9
    Likes Received:
    1
    Joined:
    Feb 8, 2014
    Ram Year:
    1999
    Engine:
    5.9
    Hi all,

    I got a 1999 Dodge Ram 1500 5.9 Magnum.
    Well the car didn't have a battery when I bought it, so got a new battery. After a week of driving the battery died, so I took it to Advanced auto parts for an electrical test and they said the alternator was not responding under load.
    So I bought and installed a new Denso alternator, got a new battery and still the car is not charging.
    Went again to Advanced auto parts for an electical check and they told me the new alternator that is installed in the car is not responding under load...Since I was there I got the old alternator tested directly and that sob works great in their tester. :owned:

    So, my questions, has anyone had this issue before? the accessory belt is rather tight, so that only leaves ground connectors and the battery-alternator cables (freaking expensive at the dealer pos and neg cable harnesses come about to $300).

    Any feedback is welcome.
     
  2. JohnD72

    JohnD72 Senior Member

    Posts:
    776
    Likes Received:
    366
    Joined:
    Sep 22, 2013
    Location:
    Charleston, SC
    Ram Year:
    2012
    Engine:
    5.7 Hemi
    You might try posting this in the 3rd gen section. They will know more about your '99 and the 5.9.
     
  3. BossHogg

    BossHogg Senior Member

    Posts:
    906
    Likes Received:
    470
    Joined:
    Feb 23, 2014
    Location:
    Oakland Township, Michigan
    Ram Year:
    2015
    Engine:
    6.7L Cummins
    If you have a voltage meter, measure the voltage across the battery with the engine running, should be greater than 13.2 depending on the battery's charge state. This indicates the charging system is working.

    Watch the meter for a while looking for voltage drops, sometimes a single cell will fail in a battery (new ones too) off and on, they actually change polarity.

    Look up your charging system wiring here;
    https://techauthorityonlinedemo.extra.chrysler.com/service/repair/wiring/view/classic.htm
     
  4. ramenthusiast

    ramenthusiast Banned

    Posts:
    129
    Likes Received:
    18
    Joined:
    Feb 10, 2014
    Location:
    W. Palm Beach, FL
    Ram Year:
    2012 Crew Cab Sport
    Engine:
    It's got a Hemi!
    Actually, a 1999 would be a 2nd gen truck.
     
    MoparMagic'00 and jbmobbs like this.
  5. luigi38

    luigi38 Junior Member

    Posts:
    9
    Likes Received:
    1
    Joined:
    Feb 8, 2014
    Ram Year:
    1999
    Engine:
    5.9
    This is the 2nd battery I got from Autozone, and same results.
    So when the car is running, I can see the needle go to 14v, when I turn on the lights, heater, heating mirrors it drops to about 10-11v and it seems the alternator cannot keep up during loads in my truck....If I take the alternator off and get it tested it passes the test from Advanced Auto, works fine under normal conditions and under load...
     
  6. luigi38

    luigi38 Junior Member

    Posts:
    9
    Likes Received:
    1
    Joined:
    Feb 8, 2014
    Ram Year:
    1999
    Engine:
    5.9
    This URL only goes back to 2010, I need another 11 years of info, mine is a 1999.


     
  7. dodge dude94

    dodge dude94 Senior Member

    Age:
    24
    Posts:
    27,698
    Likes Received:
    6,345
    Joined:
    Sep 5, 2013
    Location:
    East Texas
    Ram Year:
    1998 Ram 1500
    Engine:
    5.9 Magnum
    Merc225hp likes this.
  8. luigi38

    luigi38 Junior Member

    Posts:
    9
    Likes Received:
    1
    Joined:
    Feb 8, 2014
    Ram Year:
    1999
    Engine:
    5.9
    Replacing the PCM is an expensive proposal.

    Someone recommended me to clean all grounds from the battery to the chassis, and possibly add an extra ground from the battery to the chassis and from the chassis to the block.
    Anyone think this can help?

    Anyone think it can be the tensioned pulley? the belt looks a tiny bit lose, it maybe gives out about and inch if pressed on.
     
  9. dodge dude94

    dodge dude94 Senior Member

    Age:
    24
    Posts:
    27,698
    Likes Received:
    6,345
    Joined:
    Sep 5, 2013
    Location:
    East Texas
    Ram Year:
    1998 Ram 1500
    Engine:
    5.9 Magnum
    Indeed it is, however the PCM IS the voltage regulator, and if it's not letting the alternator respond, that's an issue.

    Adding chassis ground and cleaning them can help, definitely cheaper too.
     
  10. luigi38

    luigi38 Junior Member

    Posts:
    9
    Likes Received:
    1
    Joined:
    Feb 8, 2014
    Ram Year:
    1999
    Engine:
    5.9
    ok it seems Ima be trying the ground cleaning this weekend.
    If that does not work, I was thinking of replacing the belt and pulley tensioner.
    and if that doesn't work, then I may have to go to the Dealer and see what they say....
    thanks for the help.
     

Share This Page