Have a 2004 Durango Hemi, never had a problem with the radio...now, just changed alternator and radio now turns on, crackles, speakers play for about 15 seconds, then crackle again, and sound/speakers cut out. The radio appears to work perfectly, but without sound! I can shut it on and off but sound will not come out of speakers. BUT, this repeats every time I shut car off and restart it for another trip? I tried playing radio on just battery (without alternator running) and the same thing happens..Anyone have a clue?