I have a 1992 blazer that blows the ecm fuse. I don't have to turn key on or anything it blows as soon as i put it in thanks for your help

 

Look first at the ecm circuit, it sounds like there is a short on that circuit somewhere, meaning one of the hot wires in that circuit is grounding constantly start by looking over all the wiring under the dash, if u can trace and research that specific circuits wiring because that's the wiring that's shorted.

 

Thanks I will get started on that