A 2947404 two speed wiper switch does not support an electric motor pump for the washers. The manual foot switch is how the washer fluid is pumped to the windshield. I am showing a 2770380 variable speed switch to show that the W terminal in not installed on a this two speed wiper switch. The e body 70-71 dash harnesses were all made the same, rallye or non rallye with the brown wire present on the socket for the W position that runs to bulkhead position 19 to drive the washer pump motor if a variable speed wiper setup was installed from the factory.
The B/U terminal is the output side of the internal circuit breaker, not used on an e body and is left open on two speed and variable speed wiper switches.
The two speed wiring on the four terminal socket may require swapping of the A and F1 wiring. The effect that would occur is if you find that when turning the two speed switch on to the first position, fast movement would be enabled. Then the second position would be the slow position. If that would occur, this swap with take care of that.
Jim
