My garbage disposal was on the same overloaded circuit with many other items in my 1949 home. Lights would flicker when the disposal would come on. These were all on the same circuit.
I recently ran a new circuit for my disposal (had electrician do the panel work). Strange thing is that the lights on the old circuit, that the disposal was on, will still flicker when the disposal comes on.
The age old question, any guesses on what could be causing this flicker when the disposal is on its own circuit? Could it be that a wire is loose on the light's circuit in the panel?
Clarification: They do not flicker but instead dim briefly when the disposal first starts up. Sorry, I used the wrong words.