Radio Control Tuner

Radio ignition noise cause?
My Kawasaki motorcycle has a radio with five components: removable faceplate with control knobs, radio tuner, amplifier, low filter and antenna. The tuner was faulty, so I replaced it and the faceplate with NOS items. Now that the radio is working, I’m getting ignition noise. I connected a different antenna without any improvement. I’ve checked the ignition system there’s no loose connections or faulting wiring. I have new 8mm resistor plug wires as well as the OEM resistor caps which check out ok as well. The only thing left (I think) is the amplifier and low filter.
Anyone have any ideas of what the problem may be?
Thanks!
Additional: The old tuner would work intermittently and less so as time went by. The different components of the sound system are separate and easily replaced. I have sometimes gotten some static or noise when going over a sharp bump, so it certainly may be the ground. Thanks a lot!
First off, you said you replaced the tuner. Did you do this yourself or did you have it professionally done? Yes, a faulty ground will cause noise, but Im not sure that is what it is; you have an amp also and you said your tuner was faulty, how was it faulty? Check the wiring (grounds) and make sure they are secure. Next I would look into getting a filter for you supply line to the amp and tuner. They are not very expensive and you can just put them in line with the 12V line going to the tuner and the amp. It is basically a coil and a resistor. check into it…good luck…
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