Should car still run on alternator with ground terminal off battery?

cudascott said

Car will not run with the ground cable disconnected from the battery never. .

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Sorry not true. removing EITHER cable on a running and charging vehicle will result in the engine running on, but as others said "don't do so"

cudascott said

A method known to check the alt. is pull the positive cable.

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A person should NEVER do this.