need help with '96 SL electrical problem

Discussion in 'General Motoring' started by Larry, Sep 26, 2008.

  1. Larry

    Larry Guest

    My 96 SL just started having electrical problems. For two days in a
    row, when I go out to start it in the morning it would crank once and
    die. All power zero, even the dome light out. I got it jump started,
    and drove to work, and drove home that night, all is fine. Then the
    next morning it did it again, all power flat dead. Jumped it again,
    then after driving approx 10 minutes, all power went dead at 40 MPH.
    Coasted to a stop and tried a restart, all power dead. I got out,
    wiggled the battery terminals, hit the battery top and power came back
    on, and it started. Drove 10 minutes to auto store, and they tested
    the battery ( 3 months old) and said it was fully charged and had good
    cranking amps. They also tested my alternator and said it was fine.

    Took it home, and cleaned the terminals, even though they were not
    dirty. pulled the 30 amp main fuses and they looked good.

    Drove it to work, ran fine. sat 6 hours, started fine and I drove
    it home, all worked fine.

    Mechanic at work put his tester on the car and found nothing wrong.

    Will have to see if it won't start tomorrow morning.

    I'm thinking its not the battery because it can't recover from stone
    dead to fully charged in 10 minuted on the alternator.

    Could it be a relay, key switch or something else killing the power
    circut intermittantly?

    Larry, Sep 26, 2008
  2. Larry

    Doug Miller Guest

    If the battery itself is good, the only other thing that would kill
    *everything at once* is a disconnected battery cable -- have a look at the
    *other* end of your negative battery cable.
    Doug Miller, Sep 27, 2008
  3. Larry

    hubops Guest

    I had a 01 Taurus that would start fine ; idle fine;
    rev fine ; no trouble lights ; ..
    ... then completely die - about 1 or 2 seconds
    after putting it in gear to drive off.
    then .. start fine ; idle fine; rev fine ; no trouble lights ;
    and .. die - taking off.
    It was the ground connection on the front fender,
    near the battery, where the small ground wire from the
    battery ground cable connected.
    It affected the computer somehow, I presume.
    Good luck.
    John T.
    hubops, Sep 27, 2008
  4. Larry

    Larry Guest

    Thanks John!

    I cleaned up the contacts on the battery cables and It hasn't died
    on me for a couple of days now. They didn't really look all that
    dirty, but I sanded them down to shiny metal and it seemed to have
    done the trick.
    Larry, Sep 29, 2008
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