[motornut]

Welcome
the leak could be the kick vents seals(79 shown),
could be the area leaking under the fender(87 shown).
I understand the seat belt light/buzzer has a little timer built in,
I think my light and buzzer go for a bit only when starting... not if belt is on.
Stock antenna is in the glass,
some find the fender mounted ones are better in poor reception areas.
Is the radio stock/with CB (a lucky find)?
they need separate antennas,or at least a splitter.
some non- stock radios the antenna plugin hole is smaller