I hooked up this programmer to my serria deanli to get the stock program back on and I have no power going to it. Now I took it off and hooked it up to the yukon denali we have and it immediatly reads...Fuse maybe? Anyone know what fuse controls the OBD port? Thanks

 

Lighter/12V auxilliary outlet fuse.

 

Yup, Thank you , that was it..

 

im having the same problem fuses checked out anyother ideas 1999 gmc sierra