So I have a 2001 4wheel drive blazer, I replaced the alternator, battery and starter about a week ago. Today I went to the fire house for a call and when I went to leave my truck wouldnt start. Everything lights up and the engine clicks but other than that nothing happens. I have to have it towed tomorrow morning. But Im wondering if this has happened to anyone else before? What could it be?

 

Did you ask someone to try and give you a jump to see if the engine would start? It's not impossible that the alternator you got is no good.