Heat/cool fan won't turn on?

My fan stopped working and I replaced a few parts. The console with the knobs, regulator, and fuse. I hooked 12v to fan and it works. Also the console with knobs isn't lighting up. I'm helping a friend who isn't internet literate so kinda going off what he has told me. Tomorrow we are going to run voltage meter and see if we can find where the power stops. I'm unfamiliar with this car. Besides running voltage meter and following power what else should I be aware of? I realize the regulator and front control console panel probably aren't the problem if properly installed. Big if anyways any heads up pointers would be great. From there I'll run tests and update/ask as needed. Thanks

2017 dodge ram diesel 2500 6.7