I have a 98 blazer 2 door I drove it for the passed the 3 days and then last night I go to start it again and it doesn't crank
I can hear my fuel pump engage my dash lights do come on my interior lights do come on as well
I had my battery tested at orileys yesterday everything came back good
I believe it's my alternator because it sounded like it had a bad bearing although it isn't locked up it still spins
Is there a possibility it could be something else??

 

In both my 4DR 98 Blazer and 99 Bravada, when the battery is too weak to spin the starter, you will find only a couple of the dash lights come on, including the red batt light. You don't see the full Christmas tree. You can also tell by the intensity of the interior lights: they'll be obviously very weak and yellow. Of course, your voltmeter on the dash will also read low. If you see all this, you've got a dead or very weak battery.

 

You mentioned "it doesn't crank". Can you hear the starter click trying to engage?

 

No I can't hear the starter