1990 Lebaron 3.0, problem with charging circuit

Discussion in 'LeBaron' started by JustMe, Dec 24, 2007.

  1. JustMe

    JustMe Guest

    drained one battery already. Installed a new one, but am only reading
    11.8 volts while car is running (12.2 while car is off). There's about
    60 milliamps of drain between negative cable and negative battery
    terminal (obviously while car is off). I think this is normal, but
    regardless this isn't the problem. I imagine it could just be the
    alternator. I had a problem like this some time ago, and it turned out
    to be a fuse (some part of alternator circuit?). I checked every fuse,
    even with a continuity tester, so unless the fuse box is messed up,
    that isn't it.
    About a week ago, I left the lights on for about an hour. It started
    back up, and I raced it around town for ~1/2 hour to charge it back up
    (bad idea? Should have just left it idling?). Don't know if that has
    anything to do with it. Perhaps a little before that time, or after,
    can't remember, the meter on the dash was reading a bit higher then
    normal (I guess a volt or 2?). Prior thanks for any suggestions.
    JustMe, Dec 24, 2007
  2. JustMe

    JustMe Guest

    I just remember that my started is also prone to flake out. There are
    times, albeit rare, when it won't disengage. Thought maybe the problem
    was in the starter...
    JustMe, Dec 24, 2007
  3. JustMe

    Bob Shuman Guest

    Although I do not know what is the nominal spec for this vehicle, 60mA
    residual current draw with everything off seems at least 3X what it should
    be to me. Obviously, this is not the root cause of a dead battery if left
    overnight though.

    If you have already replaced the battery and the NEW battery is only putting
    out 12.2V with the vehicle off, then I'd either suspect you received a
    defective battery, have a bad connection at the battery, or more likely you
    have a bad alternator.

    Bob Shuman, Dec 24, 2007
  4. JustMe

    Steve B. Guest

    ntinuity tester, so unless the fuse box is messed up,
    Pull the alternator and take it to the parts store and get them to
    test it. Most likely this is your culprit. It may have been on its
    last leg already and charging the dead battery back was enough to push
    it on over in to the grave.

    Steve B.
    Steve B., Dec 24, 2007
  5. JustMe

    JustMe Guest

    yep, bad alternator. Got a junkman's unit for 40$. Measuring 14.6
    volts across the battery now. I guess it's doing it's job.
    JustMe, Dec 28, 2007
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.