a white plug under the dash of my fathers 91 legacy has a red wire burned there is 8 wires in the plug and i got the other wire colors they are blue/white tracer, red/yellow tracer, blk, green/white tracer, white/green tracer,blue/white tracer, black/white tracer, red   the haynes manual doesn't show anything about this plug the red wire splits off to two red wires so i am thinking  they are the power supply for the ecm. is there a place to download free shop manuals for this car or at least the electrical section?

try here - there is not a 91 specific one, but not a whole lot changed from 90 to 94