i have em. no problem here, it all depends where you ran your hot from, i went directly to the fuse box, never just "catch" a hot from somewhere like the cig lighter or a random hot wire from under the dash
^^ yes any electrical installation should never cause ground noise even glowing pedals, if anythin is causing noise its cause it was installed incorrectly, check your grounds, its just a ground noise/loop as trog mentinoed
if you have some radio 'noise' or 'buzzing' it might be a grounding problem like ^^^ said. Check your wiring to see that stereo and lights are grounded properly, and check to see if you can move your power wires for your lights and your head unit away from your speaker wires if at all possible. This SHOULD help...but many receivers both in-home and in-car have a little noise noticeable at very low volumes.
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