I have a 1995 chevy blazer 4x2 it has a new starter, alternator, fuel pump, egr valve, new computer, new idler pully new plugs wire and distubtor cap and a new surpentine belt but something is killing the battery what could this be?

 

light up vanity mirror on the back of the sunvisor ??
underhood light ?

take a walk around it in complete darkness

 

ive did that! bc thats what i thought at first im stuck and i dont want to "junk" it bc its low on miles im at my witts end tho

 

 

 

I noticed that you didnt list the battery as one of the things you have replaced

I had a battery in my pontiac that tested fine right after being charged
I had to fully charge , let it rest overnight not connected to anything and retest in the morning
It failed then
BTW it was a relatively new battery , still under warranty

 

it was new everything under the hood except the motor itself