95 Legacy 130 K miles Automatic 2.2 L
Had some trouble with corrosion on bat cables , cleaned and disconnected etc. Had bat load checked, I checked alt output which is 14.2 V. Drove around for a road "check" stopped once for 15 min , came home and shut off and heard "hum" under hood and located sound and felt vibration under the ABS unit. Started engine again and shut off but noise persisted in an attempt to "reset" . I eventually unplugged unit to prevent killing bat for the night as I couldn't locate the specific fuse under the hood box. I feel it is safe to drive as road conditions here are dry for moment. What am I looking to do for this issue? Is there a Switch that can be replaced or ? Thanks for reading this dialog as I hoped to include all info!
BTW- I never heard it before with engine running when doing tuneups etc.