alternator problem

dustya_383 said
.........is that why when i pull the neg. cable off the battery the car dies.?...................

DO NOT EVER DO THIS

I wish I could kill this "old wives tale" about yanking off a battery cable.

It does not prove your alternator is good

It introduces a high voltage spike which can kill electronic devices

You will NEVER find this listed as a legitimate troubleshooting procedure in any school, text, or shop manual

As Dan said, ground the unused field connection.