hey im new to this forum and dont know if this issue has been brought up but i have a 96 s10 blazer 2wd. it must have had the back window replaced because it now has rear defrost but no rear defrost button on the dash. i want to hook it up but have heard its not as easy as just hooking up positive and negative. ive also heard that it needs less voltage than everything else. any help would be awesome. thanks

 

Look for wiring behind the dash. It should be there. I do believe that rear defrost was a standard offering.