I have added a satellite radio to my car and then I bought a blue-tooth to have a my music cut out so I can speak on the phone. That is when my problems started, as when I have the blue-tooth plugged in I hear the humming and gets loader the more the engine RPM goes up or if unplug the blue-tooth the humming goes away. Can someone please help me fix this problem?
Thanks

 

Perhaps a voltage filter/regulator is needed on the power to the Blutooth unit.

 

X 2

 

Were can I find one?

 

The first place to contact would be where you purchased your Blue-Tooth gadget, they should be able to recommend a filter for you.

Another place to try is your local Radio Shack, they will probably have something to attenuate the interference you're hearing.

 

Try a search on your favorite search engine for "12V noise filter".