Alternator noise is a whine that changes with rpm.
Fuel pump noise is a whine or buzz that doesn't change pitch.
Spark plug noise is a popping of a static kind of noise that will change pitch with rpm.
With solid core wires, you would see by looking at the spark pulse shape, that you get a sharp leading edge and a sharp falling edge.
When a sharp edge pulse like this is sent down a wire, the sharp edge causes lots of radio signals at various frequencies to be generated.
Why?
Don't fight this. Take my word for it.
They are called "harmonics".
These signals that are generated are received by your radio. They can also get into your CD player.
A car parked next to yours might also pick up the noise.
Resistor wires round off these pulses and cut way back on the generation of harmonics.
I see that you have a supercharger. You may need solid core wires in order to get the spark you need.
Stock or near stock engines don't need these wires.
Why did you change to solid wires? Did it do anything to improve your performance?
If you didn't see any increase in performance with the solid wires, go back to the stock wires.
If you find that you need the solid wires, the only way I know to limit the radio noise is to shield the wires with grounded braid.
The popping noise is getting into your radio through the antenna. Filters on the DC power line of the radio will not help.
