Agreed with C. Ludwig here about the alternator...
The alternator actually runs AC - alternating current - internally and then runs through a rectifier to produce the DC that the vehicle can use.
It's the AC that causes all the headaches in terms of RFI.
In terms of dealing with the shielded wiring...
Cheap way is to use aluminum foil (on the junctions).
You can then tape over it with electrical tape so it doesn't look as bad.
They do make metallized (shielding) tape for a step up from aluminum foil.
-Ted
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