Originally Posted by NormanMatthews
Heard a high pitch from my 2008 Dutchman trailer while packed in the drive way. I could not find anything on. And could not find the source of the sound. I turned on a light the sound turned off. Could it be a low battery indicators?
Extremely loud high pitched noise can be a propane or CO alarm.
More subtle high pitched noise can come from electronic equipment.
An inverter or converter/charger may emit a high pitched noise and it may change when current draw changes.
Anything is possible, but it is not usually due to a battery status indicator, especially one that stops when current draw increase.