You didn’t say which topic you found that wasn’t helpful. So this one may or may not be.
It does sound like you may have a similar ground loop problem, if so you could try a ground isolator of the kind mentioned there.
You didn’t say which topic you found that wasn’t helpful. So this one may or may not be.
It does sound like you may have a similar ground loop problem, if so you could try a ground isolator of the kind mentioned there.