From RedFish:"In most cases there is accessory take off ( unused male spade terminal ) on back of the wiper switch."
I'm just in the Middle of finishing up the replacement of my dash wiring harness (that's why I'm rewiring the under dash gauges) and I noticed this unused terminal (looked all over for the wire I failed to reconnect). Mine is a variable speed wiper with electric washer and that is all plugged in. That leaves me curious about what could have possibly been intended for that connection - anybody have an idea?