It sounds like someone ran a wire from the radio terminal on the fuse panel to the heater control and then fed the radio off of a junction.
The factory radio wiring was a red wire and it fed the radio separately. The heater control was fed with a fairly large brown wire, (10 gage?).
The heater blower needs a large wire and I would suggest getting another harness or refeed the heater switch with a separate feed.
Jim
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