hello,,,question,,i have a 71 barracuda with the variable speed 077 motor and electric washer..yearone 71 harness..wiper switch 2770380.when plugging in to the harness to the switch,,1 multi cluster and 1 2-cluster,,theres 1 spade still left standing without a mate??its the one with a long flat lead to it??the manual does not show this lead???any thoughts??thanks tony