I have just got a OBD1 GSR engine out of a 95 integra for dirt cheap and im putting it in my ek civic ..engine is in and im at a stand still on the re wiring of using my stock si harness,i have the OBD2a To OBD1 conversion harness ready to go with my p72 ecu, my problem is : After taking a closer look at my ek harness i found my alternator plug is a 3 wire not a 4 wire like the alternator already on the b18 engine .Do i have to run a wire to the ecm(A19) to fix this (wanting to keep the obd1 alternator) any help anyone....