engine electrical wiring
 

I am a newbie; to the wiring thing. Has been very stressful trying to learn, I can say it has made me tear up! But, still trying. I have 88 mazda 323 hatchback with only 101,000 miles on it! Have taught myself all, down too changing the head gasket. Learned how to torque it! HAHA well got discouraged when I couldn't figure out where the hoses all went. Being I forgot to take pics and learn better hands on than visual looking at the workshop manual...To my problem I have 3 black with red stripes coming from the main harness and 1 that is taped off with the, I think is the oxygen sensor. Can any one help me and tell me where there are suppose to connect to