So My son put a new radio in his 1997 mustang 3.8, and the Dash clock, dome light, and speedo. Stopped working. We have checked all the fuses and they are not blown.

Is it possible that he pulled a ground wire off somewhere? Not sure how this would cause the speedo to stop working as it is a cable driven speedo and not digitally controlled (unless i'm mistaken about that)

The other weird issue is that the 12v constant for the radio had no voltage across it (I fixed this by making a 12v constant for the radio)

Any ideas would be awesome I searched the forums but most seemed to be related to the speedo gear.

<- had to add it don't know why... well it's Atari