I dont know what kind of Wire harnesses to buy
I have a 92 st blazer 4 door I want to replace the
engine harnesses but dont know the right one to
buy any help please
A parts store should be able to sort this out, you need your VIN and engine size information. If you're worried about ordering the wrong part online, then go to a local parts store and talk to a counterperson. PS: most harness kits come with removal tools to make getting the old one out easier.