Need help 4wd not working

[Macmillan]

Hello I’m new to the page and I really need help. I changed the steering column in my 2004 gmc duramax yesterday. Now I’m having electrical issues it’s showing the abs and brake light is on. Also I lost voltage to the 30 amp fuse for the heat . the most important is my 4wd won’t engage and it says service 4wd. 

[Niners 365]

Quick question. Did the steering wheel column you take out have an air bag in it? If so did you pop it or blow it? Those bags have sensors inside that can mess up alot of electrical items. They can only be replaced at dealerships. Those literally have to be static grounded and removed with special tools. 

  I would also check all your connections, make sure all are seated correctly. Especially at the 30 amp fuze, also replace fuze. If it blows out, you have a short somewhere. A kinked or pinched wire can do this.