SOLVED!
How about an electric fence...
MY OWN. Even after killing my main, I still heard the noise on my truck's radio, so I switched it back on and kept looking. Today i shut it down and left it down for a few minutes and the noise went away. main back on, noise back on. Started shutting down circuits, and viola... That fence box must have a hell of a capacitor, because it carried on for a while after the power was off.
Turns out some weeds had grown into the hot wire. Problem solved. Thanks for the replies.
How about an electric fence...
MY OWN. Even after killing my main, I still heard the noise on my truck's radio, so I switched it back on and kept looking. Today i shut it down and left it down for a few minutes and the noise went away. main back on, noise back on. Started shutting down circuits, and viola... That fence box must have a hell of a capacitor, because it carried on for a while after the power was off.
Turns out some weeds had grown into the hot wire. Problem solved. Thanks for the replies.