Do you mean not turning the engine off? Absolutely not. The battery is the key component in helping the voltage regulator maintain system voltage to a safe level. Without the battery it is possible for system voltage to go as high as 30 volts or more and destroy all the computers on the vehicle. Every year I did that with an alternator on the test bench to show my students what could happen. There's no reason to try to run the engine without a battery.
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Tuesday, October 9th, 2012 AT 7:57 AM