all of a sudden no power to the Radio - 328

Do 328s still have the infamous fuse block of the 308? I had a similar problem recently, it turns out that the voltage supply to the radio fuse is jumpered from the spade terminal next to it (which is directly above the fuse for the lights up/down). The jumper had either arced or rattled loose or something, so there was no contact between the jumper and the supply terminal for the fuse. In my instance, I was able to put the spade terminal directly onto the unused male spade that was directly above the radio fuse and get tunes back. Back at home, I just dribbled some solder on the interface between the jumper and a rivet that was the key failure point and all's well.
I hope that made sense, and I hope it helps with your problem.

 

I would first confirm you do/do not have power to the radio...it is entirely possible the radio died.

 

Try pushing the head unit in/into the dash.

I know my alpine head unit sometimes gets loose and you have to just give it a gentle push back into the radio holder.

 

Oftentimes the radio will have its own inline fuse. If you had the plate to the antenna out, it is possible it grounded momentarily and blew the fuse (depending on how the stereo was wired!!!) Actually, it is most likely just a coincidence.

In any event, first look through the fuse box to ensure there are no blown fuses. If not, go behind the stereo to look for a wire with an inline fuse. It might just be dangling below the dash.

If all fuses are good, I'd go with the "a swift hit" technique.

 

If you have the unit out check for power there, if you have power, then hook up another deck to see if it works, then you will know it is the head unit or not.

 

Spot on

 

Incidently, that is how I discovered the fix for my radio!

 

It's giving you a hint: "The radio's behind you..."

 

I would disconnect the inline fuse behind the radio and check the voltage there.
If you don't have a voltmeter , run a separate 12v wire directly to the radio and see if that works.