"Why must the negative cable be connected?" - Saab 900 Bulletin Board - Saabnet.com
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"Why must the negative cable be connected?"
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Posted by JohnB (more from JohnB) on Sun, 4 Feb 2001 05:52:21 Share Post by Email
In Reply to: starting problems, snaab [Profile/Gallery] , Sat, 3 Feb 2001 18:59:54
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O boy. There appears to be a basic lack of understanding of electricity.
Hard to tell what you've done to the car from your description.

If the battery negative cable has been disconnected, jumping the battery won't do squat.

The booster battery has to be connected to both the positive and negative cables on the car...usually they're connected to the battery. BOTH cables have to be connected for there to be a current flow.

If the battery has been frozen, it's probably not a good idea to connect the car cables to it and then jump it. The car should start/run/turn over/whatever with the jumper battery connected in parallel (pos to pos, neg to neg) with the jumped car cables...essentially it's running on the jumper battery.

BTW, depending on what you're using to jump the saab, it might not do the jumping car electrical system any good. Yes, thousands of cars are jumped every winter...and with the computer electrical systems on many new post-90 cars, some get fried with voltage spikes from the electrical systems of the jumped car when they start and the jumped car's alternator kicks in....

The general technique is to use the jumper car to charge the dead battery for twenty minutes and then disconnect to start the dead car. Or at least shut off the live car. But you can take your chances...

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