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  1. #1
    Dave T.
    Super Moderator Dave T's Avatar
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    03 Aug 2010
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    near Seattle, Washington
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    1,371
    Saab(s)
    1999 9-3SE (2013-2015), 2005 9-3 (2005-2013), 1990 900 (1990-2003)
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    Jump starting a car - what I learned

    I thought I knew how to jump start a car.

    + to +, negative of good battery to ground of the bad car. Also don't have cars touch, don't let jumper cable clamps touch, etc.

    I tried that. Nothing.

    Then I connected the negative of the good battery to the negative of the bad battery. It worked. I wonder why even though this is not the correct or best way.

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  2. #2
    Saab Nut
    Join Date
    10 Apr 2017
    Location
    Denham, England
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    413
    Saab(s)
    2011 2.0 9-5 Aero
    Thumbs Up:   59
    Most likely the ground you choose on the car with the flat battery wasn’t a good enough contact.

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  3. #3

    Join Date
    26 Apr 2020
    Location
    Winder, GA
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    2
    Saab(s)
    1999 9-3 SE
    Thumbs Up:   0
    Quote Originally Posted by GeoffR View Post
    Most likely the ground you choose on the car with the flat battery wasn’t a good enough contact.
    Most likely this, I always like to try to find a bolt on the body of the car somewhere.

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  4. #4
    Dave T.
    Super Moderator Dave T's Avatar
    Join Date
    03 Aug 2010
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    near Seattle, Washington
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    1999 9-3SE (2013-2015), 2005 9-3 (2005-2013), 1990 900 (1990-2003)
    Thumbs Up:   26
    Quote Originally Posted by GeoffR View Post
    Most likely the ground you choose on the car with the flat battery wasn’t a good enough contact.
    Good answer! However, the ground that I chose was the spot recommended in the owner's manual, the ring to lift the engine. Perhaps the clamp didn't have enough contact or something. I will soon find out because the flat battery needs another jump start. I just ran the engine at 3000 rpm for 5 minutes 4 days ago. Maybe that was not enough to recharge the battery.

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  5. #5
    Saab Nut
    Join Date
    10 Apr 2017
    Location
    Denham, England
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    413
    Saab(s)
    2011 2.0 9-5 Aero
    Thumbs Up:   59
    Quote Originally Posted by Dave T View Post
    Good answer! However, the ground that I chose was the spot recommended in the owner's manual, the ring to lift the engine. Perhaps the clamp didn't have enough contact or something.
    The other possibility is that the engine isn't actually a very good ground, possibly the ground strap is less than perfect?
    Quote Originally Posted by Dave T View Post
    I will soon find out because the flat battery needs another jump start. I just ran the engine at 3000 rpm for 5 minutes 4 days ago. Maybe that was not enough to recharge the battery.
    Battery charge is determined by time and current, engine RPM has nothing to do with it. You need around 5 miles to recharge after a start, if the car hasn't been used for a while 30 or 40 miles might be required to reach full charge.

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