Gentleman, I have used the wiring diagram that "complexvariable" shared with us. I have noticed that with the fused switch on my light is on wether it is running or not and it doesn't make any difference if it is in gear or not. The power feed to A terminal is killed through the brake switch but pin B is grounded at all times and pin D has a trace of ground. I checked the pins with my DVM and if you hook the negative to pin B and the positive to a power scource it will show battery voltage, pin D will show 4.5 vdc. I have also ohmed Pin D to the case and it shows continuity. I have not drove it yet but it starts fine and goes in and out of gear as it should. I thought pin B provided a ground at lock up? Can anyone straighten out my fried brain? Thanks G