HI

I have been fishing around the different forums to see if anybody has had problems with the stock radio when you turn on the rear window defogger. When I bought the car the amp was dead so the dealer that I got the car from got another one off ebay. So now when I turn the rear defogger it interfers with the radio shut it off and the radio is fine. Is there a filter or some sort of resistor that needs to be installed or a new amp.

Thxs