you should check the condition of the battery(s). are they severely discharged. is their water at the proper level?
we don't know the condition of your garage wiring. does a load of 8 amps or so make the lights dim?
the hum from older converters is normal.
once you know the state of the batteries, buy them a nice new converter that will keep them properly charged :-)
2012 F150 Super Crew 5-1/2' bed Ecoboost 4x4 3.73 elec. lock diff. Propride hitch
give life. kidney & pancreas transplant 9/9/06
Ingrid-my unofficial '"World's Oldest Streamer" 1909-2008 R.I.P.