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Thanks for the response! I appreciate the guidance!

So it seems to come and go some. Usually, I hear it when the volume is low or even completely off (most of the time when I start the truck up and the radio hasn't clicked on yet or after I shut the truck off and am about to get out). Almost seems like when it's kinda like warming up or cooling down, so to speak.

I just tried to pause the music while its playing and I didn't hear any grumbling...but I'm pretty sure I have heard it when I did that before. It seems to come and go some and definitely is worse some times rather than others. Thankfully, I can't say that I have ever heard it when the music is playing.

Do you think it's a wiring issue? Seems strange to me that it seems to come and go. Thanks again for the guidance!