Aftermarket sound system 95 Max. Signal interference, especially AM radio, a big problem when key is ON and when motor is running. No interference in ACC key position. Noise seems not to be related to RPM, just a constant static hum, similar to 60 Hz hum. Occasional changes in hum when certain electrical items like headlights are turned on. Any ideas as to what is causing this interference? TIA Bob
95 SE Auto
89 SE Auto traded