help with computer short
1987 lx 50 5 speed, 89 mass air engine harness with 02 harness"susposed to be a 1989 harness with the 02 harness jumper wire from pin 1 to pin 6, car ran fine,shorted out powermaster alternator from battery to alternator case had big short, burned out the computer, ignition switch, and starter solenoid, replaced all, then everytime i start the car with my clutch pedal to the floor i short out the computer, didnt matter if it was a 5 speed computer or automatic, i replaced the clutch switch also. i sent my computers out to be repaired and they told me the burnout was pin 46 signal return, i replaced my engine harness with another 1989 engine harness and i used a 1988 02 harness, "from what neomustangs put out" my 1988 harness must be mass air because it has a jumper wire from pin 1 to pin 5 in the 02 harness. with that harness in the car the car starts and runs but runs rich with the a9p computer, when i put the other 02 harness back in i blow the computer when i put my foot down and off the clutch, can a 02 harness that was working in the car before the short go bad?i even changed the 02 sensors and i pulled the dash back and checked the whole dash harness and found no bad wires or plugs..?????