Re: Re: Professional Tinkering 6 to 12 volt

Posted by Doug in OR on January 19, 2004 at 10:30:38 from (67.166.95.121):

In Reply to: Re: Professional Tinkering 6 to 12 volt posted by tractorboy on January 19, 2004 at 07:38:47:

A lamp does not act like a diode. A diode will pass current in one direction, but not the other. A lamp will behave like a resistor. A variable resistor, in fact. As the lamp glows brighter, the resistance increases. In the case of how Bob M is using it, the lamp is designed to do 3 things. 1) It provides a current path to the exciter windings. 2) It acts as a warning light would act - it indicates alternator status. 3) It acts like a resistor - it drops the voltage when the alternator tries to backfeed to the ignition switch. This should prevent engine run-on.

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