What Jim said about using a portable radio is a valid method we used as Hams to find the source of static on the amateur radio bands, or in this case a loose connection. Portable battery powered radio on AM tuned to a clear frequency will find the source. Plus I always touch circuit breakers and other suspected areas for heat sometimes indicating a loose connection, and your touching the insulated areas!!!
Last edited by Bill George; 03-15-2023 at 9:08 AM.
Retired Guy- Central Iowa.HVAC/R , Cloudray Galvo Fiber , -Windows 10