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I have a filter on my radio, that runs in line with the power feed.  That seems to have helped, some. Also, I took some advice that was suggested to me by other forum members,  and I am pulling power directly from my battery.  I ran my ground (negative) to a bolt on my grab bar, and my hot to the positive terminal on one of my batteries.


Back to the filter, mine is a Pyramid NS-2. I picked it up from some random truckstop that I happened to pass through.  It didn't cost much.


New Egg has one:


https://m.newegg.com/products/9SIA20T2EM9088


You can probably find them, elsewhere for less, though.  New Egg strikes me as over priced on everything they have.


I also see, from time to time, a Diesel branded noise filter. I have seen the same one labeled "Barjan". Those are larger, though. I have one, and have found that the much smaller Pyramid model works better.


My truck is nothing more than a massive, diesel powered, cheaply and shoddily built, rolling computer system.  This thing produces a ridiculous amount of electronic noise.


I had forgotten how bad the noise was, until the other day, when I hooked up my backup radio, temporarily, in a truck that my wife needed to drive for the day. That Pyramid does work.