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My world for a wiring diagram!!! 200

posted by  jbowser on  Fri Apr 25 14:59 CST 2003
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last visit: Fri Dec 24 08:36 CST 2010
[RELATED]

According to the wiring diagram (Mitchell on Demand) for a 1984 a brown wire goes back to the computer module and a green wire goes to the O2 relay (looks like terminal 87B) and also the module... The other connections to the O2 relay are black (ground), red (+12v), and blue which goes to the fuel pump relay.

Just looking at the diagram (and being a 20 year out of practice bench tech) it looks like maybe the fuel pump relay (when closed) supplys +12v to the O2 relay which in turn might put +12v to the module and freq. valve while the other wire to the freq. valve from the computer might supply a variable frequency "ground" depending on o2 sensor reading?

Good luck,

Justin B.
83 Turbo






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