...check the horn fuse
...then, check the cigarette lighter fuse.
both affect the radio, most likely it's the horn fuse.
yes...it's a goofy setup, GM.
oh, and if it's an early model Blazer, 88-90ish then there was a
service bulletin for the
cigarette lighter socket.
...and when your dash gauges start acting goofy, there's a chassis
ground wire that likes to work loose at the bottom left of the dash.
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