Help, Neutral Safety Switch

[Duck.E]

All my lights work on the truck except the reverse lights. I noticed the fuse was blown and I replaced it and nothing. So I replaced the NSS and before I put it on I hooked it up and moved the switch and the reverse lights come on. So I thought good, I installed it on the column and blows fuse every time. As soon as I turn ignition it blows, but with switch off it works when I move it. Any suggestions, help? All wiring, harnesses, bulbs, and housings are new.