Hey, there is no "political correctness" needed here! "Pecker Head" is a now commonly accepted term in much of the US for a motor termination box. As I learned long ago, the term was derived from "Picker Head" which was a protrusion off of a drum in old farm machinery which caught the material to be picked, be it an ear of corn, a sunflower head, a cucumber etc., and separated it from it's stalk or vine. Because the termination box on an electric motor looked very similar, it was called (probably) "that there picker head thang on the 'lectric motor"! Interestingly enough, in the South the term "Peckerhead" already meant a dullard and was also apparently derived from "Picker Head", but meaning someone too dumb to do anything on the farm but be a picker. With a Southern twang, "picker" can easilly end up sounding like "pecker".
The non-PC meaning of either term likely came along a lot later.
Hey what can I say. I did an etymology of common electrical terms once as a term paper for a class and the prof liked it so much he gave me extra credit to research oddball terminologies. I've forgotten most of them now but that one stuck because I later used it a lot.
