I think I can put some basic rules of troubleshooting basic lighting and power circuits on to a single sheet of paper. Simple enough for the average 4 year journeyman to understand. Two sheets of paper tops. Its not that hard.
Motor and systems controls, different story.
And, yes, I totally agree, experiance does count for a lot in this area. So does the willingness to learn....
Mark Heller "Well - I oughta....." -Jackie Gleason