How can i install a car stereo without a wire harness?

I have an 89 toyota pickup and the aftermarket stereo was stolen. The wire harness was removed during the theft so only the stock bare wires are in the car. I dont want to pay for an installation because I know how to install it, I just dont know how to wire it. I found wire diagrams online (installdr etc) and have hooked it up as directed, I even changed the radio fuse (which was blown) I still have no power or response. Does anyone know how this is done in an installation shop ie hard wiring with a volt meter?How can i install a car stereo without a wire harness?your going to need a wiring harneess