Neutral Safety Switch

I am having trouble with my NSS. I had nothing when turning key. Disconnected wiring at switch and then It turned over. Removed harness and checked connections and everything fine. Plugged it all back in and nothing. I suspect the problem is further down the line in the column. Any ideas?.

PS Car now has B&M shifter and instructions say use the original NSS and disregard the micro switch on the shifter