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"but that wouldn't explain why the engine died as soon as the jumper cable was disconnected."
Yes, it would. The fact that the engine shuts down when you disconnect the jumper cables from the boosting vehicle indicates that your battery is dead or has poor connections to it. Or that your alternator is not charging. (This assuming that your battery remains connected, it should be, while the car is being jumped.)
If you can't buy a multimeter or borrow one, try charging the Volvo battery with the boosting vehicle.
- Jump your car but don't start it.
- Run the boosting vehicle's engine for a few minutes so that it charges your battery.
- disconnect the jumper cables and try starting your car.
- if the engine doesn't turn over then the battery is defective.
- if the engine does turn over then it is likely that your alternator is not charging.
- Note: I'm using the term "turn over" because the car doesn't have to start in order to determine battery ability.
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1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.
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