What I am saying is that the alt warning globe is actually an integral component of the voltage regulator circuitry. if it blows, due to age, vibration, over voltage etc, the alternator will not work. Therefore, if your alternator is not working, checking if the globe is blown is one of the first and easiest things to look at.
Always replace it with a similar wattage globe as it will affect the operation of the regulator.
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