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I agree with 88 LE. The most likely cause is a bad alternator which allowed the battery to become completely drained while driving. Sometimes, when you try to jump start a completely drained battery, you have to put the cables on and leave them connected to the other car's battery for a few minutes, while the other car is running. This allows the other car's alternator put a bit of a charge in to your completely dead battery. 5 minutes should do it. Then try to jump start it. If this is the case, it should start. The only caution I give here is to use a good thick set of jumper cables. Real cheap ones (thin ones) can actually melt when connected for any length of time. Once the car is started it will only run for a few minutes until the battery is completely drarined again. If this starts the car and that few minutes doesn't allow you to get the car to your mechanic or to get the car to somewhere safe to work on, then you could bring a few tools to the car and remove the battery from the car and have it charged from an outside source. If the battery is good and strong, this will allow you to drive the car about 30-45 minutes. When running you can also use a DVM (digital volt/ohmeter) to test the car's battery and alternator. Set the meter to 20 volts DC and touch the leads to the car's battery posts/terminals. Polarity doesn't really matter here; you will get the correct reading in volts. It might say (-) in front of the volt reading, but it will be the correct numbers. If the alternator is working properly, it should put out around 14 to 14.6 volts. With a non-working alternator the reading will be 12 volts or less. Changing an alternator is a fairly easy and quick job on these cars, for the average do-it-yourselfer.
Good luck.
Mike
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