hi guys after i installed my illuminated doorsills on my car I got help from a buddy who used to work on mb cars at the stealership, everything works fine but I got a annoying sound after these were installed, the sound is heard sometimes and other times not.

Here is the explanation:
When the transmission changes it's gears I sometimes hear a sound on every gear when trans is shifting, it's sounds like a whisstle on every gear. Sometimes it sounds from the car like if I had a SUPERCHARGER as a C32 AMG in my car, this is the sound.
It's not my rear axle givin' pinijon sound.
This annoying sound vanished once when I turned off my radio, on the on/off button.
I think I get some interferrence from the alternator (generator)
I have installed a electronic jammer between my battery and the wire from the doorsills, without any improvment.
thanks for your help