Why does my heater and radio not work. but heater will when radio unplugged??

1997 PONTIAC BONNEVILLE
189,000 MILES
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KEVINBENTLEY815
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Neither my radio now my digital display heater work when I plug the wire harness into my factory radio. If I unplug the radio, the heater works... any ideas???
Nov 4, 2011 at 10:09 PM
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