Last year I got a ’19 cascadia, did all my usual stuff transferring things into it including an inverter I had been using in my previous truck. The cb worked just fine in the 125 I came out of. When I get the inverter and all setup as soon as I switched the inverter on the needle swept clear across from the noise.
As things sit now, The inverter is connected to a dedicated 600Ah lithium bank for electric ac to reduce idling, the batteries are charged by a charge controller to save the alternator.
I have tried a separate antenna, grounding everything on the cb side, Checking ground between the body and frame, even did a voltage drop test with as many loads active in the cab as I could and I got no change on the meter so the existing ground is carrying the load just fine. Hooked the cb to a small agm battery for testing, same for the inverter before I setup the homebrew EPU, I had a samlex 2kw pure sine inverter to start, I swapped that for a jupiter 2kw pure sine and the noise is identical. I found a video about installing a couple of 1uf capacitors to help and that did nothing. it’s just noise all over the AM, cb and radio.
I came across a thread here but it’s a bit old, I too have noticed the noise coming from the newer cascadias and it has had the same 60hz harmonic that I hear from my inverter.
It almost feels like it’s something with the truck that is causing the problem to resonate within it,
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