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Originally Posted by CivicSpoon
The alternator plugs are different as well. The OBD1 is round and the OBD2 is square (if I remember correctly), but regardless they plugs are different. You can either use an OBD1 alternator, or swap the guts of the OBD1 alternator into the OBD2 alternator's housing. You'll only need to swap the part that the plug is attached to, it will be pretty obvious once you taken them apart.
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Couldn't you just swap the plugs on the harness? Or is there a diff in the amount of pins or something?
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Originally Posted by CivicSpoon
For the injectors, there is a slight difference other than plugs. I have no idea what issues, if any, that there are with wiring the injectors backwards or not (positive and negative). I compared service manuals before, and the OBD2 injector plugs are wired in reverse from the OBD1 injector plugs. But I've never read about anyone having an issue with wiring them in reverse before, so it might not matter. But personally, I'd just use OBD1 injectors if you have them, for ease of installation.
You could just use an OBD2 engine harness if you wanted to use all the OBD2 parts (dizzy, injectors, and alternator), it's completely plug and play with your stock sub-harness.
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Didn't know that part... about the sub-harness.. then again, how did you? We don't know what car he has, since he never told... although I've seen where diff harnesses have plugged in and been compatible. I can't remember which ones though, I think it was OBD-2 to OBD-1 (B18B in a EG or something similar).