What is the amperage output of a '04 Chevy Silverado 1500 5.3 Liter stock alternator?
by 
dtfred
ANSWERS: 2
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90 amps. This is provided by three 30 amp zener diodes inside the alt. You can have any or all diodes go bad leaving you with 30, 60, or 0 amp output.
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I do not know the answer to that question, but I will give you a guide to what it should be. I am going to use the average car/truck battery numbers. you probably have something in the range of 880 CCA. with something like 14 hours at 20 amps reserve capacity. SO this is how the optimal charge rates are for the battery. During the deep cycle charge of a battery, it accepts 5% of its CCA. so at max Amperage, your alternator should put out roghly 40 Amps. Then once you reach about a 90% charge it should switch to a median charge, to get full charge, which is 1.5% of your CCA. At this level it should be putting out roughly 13 Amps. This is pasted from another similar question I answered. Obviously you probably have a higher CCA battery. I would use this as a general idea of what you NEED tho in case you are trying to up your battery size.
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