To get a better idea of what’s going on, could you share a few more details?
What year is the Edge?
What engine and trim is it (SE, SEL, Limited, etc.)?
Do you know exactly what work the garage did before the problems started?
Did the issues start right after picking it up, or was there a delay?
When you say the instrument panel isn’t working, is it totally dead (no lights, gauges, warning lights), or are some parts still working?
Any other electronics not working, like the radio, HVAC, headlights, etc.?
You checked all the fuses visually? Did you test them with a multimeter or just look at them?
Also, about the alternator, was it overcharging (15V seems a bit high)? Curious what made you decide to swap it out.