Neutral Safety switch wiring on 68 A body

'68 was the last year for the single-pin switch, which serves only the neutral safety function. '69-up 3-pin switches serve both the neutral safety and reverse light functions. You will find two ¼" male spade terminals on your starter relay. One has a yellow wire that goes live when you turn the key to the "Start" position. The other should have a brown wire running from it to the neutral safety switch.