I happen to buy a like new 100 amp alternator from a member so I can put it on
( was a spare ) in back of truck for future so if it fixes it I will go get bad one rebuilt from old trust worthy company near me versus some junk from autozone etc .
I wasn't suggesting he buy one from Autozone just saying he could get it tested there and on top of it for free. Always love free. This is a good place to start your diagnosis and if the alternator proves to be good then you can move on knowing it is good.
