some 1960s, 1970s Harleys did have radio- sometimes Motorola radios. Police specials and the few touring specials with the large generators and large batteries did have electrical outlets and fuse box for radios and some did come from dealers with ordered radios, external speakers. BMW and Moto Guzzi of same vintage 'police specials' had the larger alternators or generators for police radios- the civilian sales of the 'specials' had the electric capacity , some had CB, others had ordered in by dealer radios. English Bikes? Triumph 500 had a large alternator model for NATO use with radio capable large battery, 650 Police special had same alternator about 250 watts instead of 160(?), extra wiring with some connectors, extra fuse box. 1964-1966 or so was USA market requirement for parking lights, emergency lights with engine off, stronger headlight standards- that was when some cycles got upgraded alternators, generators and capacity for small radio with a big speaker- customer or dealer installed radios sometimes.