according to my 64 FSM, the single black wire is the 12v source. the ground is the radio chassis, and can be hooked to the battery negative.
the two brown wires are for the speaker.
if it has a light socket, that wire should be orange.
hope this helps.
Thank you....one more question...in 1964 was the radio light standard or an option? I only have the 3 wires.
i would think there is a place for a light socket somewhere around the face plate, but without seeing the radio i can't say for certain.
all the 64's i have owned in the past, A, B, and C bodies, the radio was illuminated.
For certain years, the OE radios had a single dial light that turned ON/OFF with the radio, here the radios were mostly only AM.
However, later on when they added FM and some with tape players they had a separate wire output connection just for the light illumination circuit, and this was connected to the dash lite circuit so that the radio light briteness could vary with the other instrument dash lites.
Just my $0.02...
