I have been having the same problem. Kill switch on 3 Civics are wired properly, I even have the drivers kill the electric fuel pump and igntion prior to turning off the kill switch.

I hve been told by my rebuilder (who is tired of warranty repairs) that the diodes are susepable to buning de to units running at high rpm and suddenly dropping to low rpm repeatedly.

I don't have and answer yet. He is working on producing a singe wire version that he thinks will do the trick. I hope so.

Any better answers????

Maurice