at least thats what the guys at advance auto told me after testing it. that means my alternator is toast right? since it should be putting out like 100amps i think

 

what load did they apply? the alt should produce 100 amps if theres at least 100 amps load.

 

alternator output is based on rpm as well. think old-style dynamo on a bicycle, it gets brighter as you pedal faster. alternators a little more advanced because it has a diode bridge and voltage regulator that regulates your output voltage.

 

it doesnt mean its toast. as RPM increases output amps increase.