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Originally Posted by b's
it should keep on running as long as you don't disconnect the ground. you can disconnect the postive and the car will still keep on running because your alternator act a power supply. it's what charge your battery or supply power to the car. the battery is just there so you can start the car. but if you disconnect the ground than the car would stop running. engine won't run without ground cable connect to battery or without ground at all.
i hope this help
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once you disconnect the positive cable from the battery it is completely disconnected. You are right that the car needs a ground and that ground is always the chasis of the vehicle, not the negative terminal of the battery. in fact the negative is grounded to the chasis.
I know there a few cars that use a battery to start then run off then alternator. I remember watching some special on ferrari's on speed channel a few years back where they did that.
KC: what to you mean they nead 'field excitation'? I have never heard that before.