Where can i find a Spark plug wire diagram 1994 Honda civic?

This site will show you the wiring diagram of a radio harness for just about any vehicle. Hope it helps

http://www.the12volt.com/

or do it the old fashion like i did if the radio diagram says the blue wires on the radio are for the left front grab the wires from the harness coming from the car and grab the two from the harness and connect them together and if the back right speaker comes on , disconnect them and grab the wires from the radio that says back right and connect those two. repeat this until the others three are sounding in the right order until done