Sorry to bother I followed your post but im not getting the same results. How to add an external range pnp switch to a transmission. I'm working on a 2000 Pontiac Bonneville 3.8se It has the internal switch. I am trying to add a external to get it to start in park. I've followed the wiring but that's where my problem is your diagram show different wires then mine. Your diagram shows Red/black To black/white Green/white to yellow Yellow/black to grey Grey/white to white In my diagram these colors match the connector inside the transmission but I am trying to wire it from the connector to the transmission the colored wires to the f - j connector all match the safety switch wires Bw/bw Y/y Gy/gy Wh/wh I ran my ground when I try to start it only my 3rd gear light on the dash lights up like it's shorted. I'm pretty sure I'm getting something mixed up. If you wouldn't mind emailing me so I could get this worked out that would be great zachbaldwin1992@gmail.com