Both speakers in rv are emitting a low volume high pitched squeal even after disconnecting the start battery. It seems to vary in intensity at times. Before I begin to trouble shoot looking for sugges...
The sound you described sounds a lot like when my TT power converter was failing. With all loads switched off, the converter would "hiss". Tun on any light, it would immediately go away.
A couple of months later, it died during a camping trip. I replaced it with an Iota 55W converter, never had another issue.
When you hear the noise, try turning on a load, see if it goes away. Easy enough to troubleshoot if this is the problem.
Good luck, I hate chasing gremlins!
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