Re: mercury kill switch
The wire on a "mercury filled kill switch" is capped off as if grounded it will ground out the distributor resulting in no spark. If your adding a remote kill tether you want to break and splice into the white wire as it supplys voltage to switchbox. Your switch should be normally closed with tether attached and open when removed. The salmon wire does nothing in a distributor engine as it never is pinned into internal harness, it only used on a ADI ignition system