Engine noise in Gamma Radio

[dm671]

I wanted to inquire if anyone has experienced a
similar situation and how they resolved it. I swapped
out my Delta radio from my 91 20020vTQ and replaced it
with a Gamma radio from a 95.5 S6. Whenever i turn it
on, it generate engine noise (whinning) throughout the
car speakers.

Main reason for installing the Gamma was to retain the
stock look.

TIA.......  


 
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