*****1995 CHEVY K1500 PICK-UP*****

Long story short some idiot jacked my explod deck but cut out the factory wiring harness. I went to the junk yard and the closest harness i could find was off of a 1998 CHEVY BLAZER. That leads me to my first question: WILL THIS HARNESS WORK? So far i have matched the harness up wire-to-wire with each wire's counter-part in the dash, but as of now, i only have my front two speakers working (REAR SPEAKERS ARE NOT WORKING). Also, i am not getting either constant power, or memory seeing as everytime i turn the truck off, ALL PRE-SETS AND CLOCK ARE RE-SET.