Get rid of FM buzzing?

[I Like Waffle]

Is there an easy fix to get rid of FM buzzing? I can almost never listen to FM radio at all because the buzz is so bad. It happened when i changed my plugs, someone told me its because i need to get resistor plugs instead. Is there another fix to this problem? Problem doesnt happen when cars off.

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[fbi90909 5,000+ posts]

check your grounds.

 

[I Like Waffle]

Grounds are good...sanded to bare metal and greased over connections to prevent rust. For my big 3 though i used the factory chassis ground which goes to the fender brace which is part of the frame. Think i should change out the other grounds? (the ones that are braided wire)

Also for my 2nd batt i have a positive run from the alt to it, then a neg run to the other batt, which is about 6ft. Should i ground my 2nd batt to the chassis too? They are both under the hood.

 

[JimJ 5,000+ posts]

You shouldn't be getting ignition noise on FM...did you replace the wires with lesser ones?