Garmin 200 VHF Failure

My radio problem with engine noise started after 25 hrs during break in. I suspected the alternator had gone bad.
Thanks and I will check the alternator ground first. Can an alternator shop test for this problem? I put an amp meter on and its putting out close to 80 amps with heavy throttle and much less, around 20 I think, at idle.
Thank you for your suggestions.
 
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