Electrical gremlins after install

[MTC214]

So it looks like I will be taking my truck back to the shop that installed my z140 next week, but I'd like to see if yall had any thoughts on this case. I had the unit installed in a 2005 GMC Sierra 2500HD. They used the proper harnesses because I still retain all functionality (OnStar, the door chime through the head unit, etc) The first thing that does not work is the auto dim when I turn on the lights (this thing is bright at night! ) But it seems that a few button lights on my AC unit have now gone out. Also the volt meter in the dash is not reading the proper voltage output. I load tested the alternator and it is fine. For what it matters the truck has a 2 battery system. Any idea what could have caused these issues?

 

Thanks!

[loy]

If it doesn't dim then the illumination isn't hooked up correctly or the feature is turned off on the unit. Maybe they forgot to plug in a wire behind teh ac controls? Could also be simply a blown fuse.