I have a 74 K5 blazer and I would like to install a stereo and 4 piece speaker system. The only problem is all the preexisting wiring is completely gone and there is no stereo in the truck already. I've looked for diagrams and videos, but none of them showed how to wire the truck from scratch. I have basic wiring skills, but some help with this would be great.

 

I can possibly help you, but you would have to find some kind of wires (whether cut or not) in the dash area and take clear pics to see what you are working with. Maybe different angles too.

 

Stock stereo or aftermarket?


If aftermarket and you are starting from scratch, all you will need to run from the truck's main harness to the stereo is the +12V constant, ground, and ignition source wires. The rest of the wires will go to the speakers you will install. A bit of time with a multimeter under the dash at the fuse box will help you identify the +12V and the switched ignition source connections that you will have to make.