Wiper Motor Switch Schematic Doesn't Agree w/the Physical Part? 68 Dart

I have rebuilt hundreds of the MoPar variable speed wiper switches through the years.

@townsend is correct. The 'BU' terminal is hot all the time. It is connected internally to 'B' and is left uncovered. It wouldn't hurt to put tape / heat shrink over it to keep from bumping into it and accidentally shorting it to ground.