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James,
Whatever you do do NEVER disconnect the battery with the engine running.
The reason for this is that if the alternator WERE charging, suddenly removing the load (ie the battery) can produce a voltage surge with could ruin not only the alternator, but any of the electronics on the car.
In the worst case, if the battery was gassing the resultant spark at the terminal could cause the battery to blow up in your face!!!
Either change the battery for a known good one, or charge and test the original.
If the alternator is not charging the battery will not keep the car going for very long.
If the engine won`t even crank over you can forget about it being the coil, this has no bearing on the engines ability to turn over on the starter.
If a freshly charged battery does not sort it out you have a poor connection somewhere which will require finding and fixing.
Colin.
1990 740SE B200E/M47, remote C/Locking.
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