Let me cover a few other points - in addition to Howard's highly-detailed, functional explanation.
When it comes to all those hoses, I find the shop manual illustration for washer installation, in the "Accessories" section, a little confusing. Plate No. 42 in the parts book is a little easier to follow - UNLESS the car has push button control for the Twin Ultramatic.
The books weren't updated to show that, with all the additional relays mounted on left fender splasher, the vacuum-operated windshield washer jar had to be relocated to the right side cowl area, when equipped with push button transmission control. Yet, only three hoses were rerouted - one fluid and two vacuum. None of those should be causing your problem, since the washer pump is electrically activated.
Figure 13 in the "Instruments" section of the shop manual should give you a better idea of the vacuum hoses and control cable from the wiper switch to the motor - isolated from the washer hoses.
While the factory warned (in
SC Vol. 29, No. 5) of the vacuum hoses being reversed at the switch, your statement that the wipers "suddenly stopped working" suggests that everything was hooked up correctly. So, I'd inspect the two hoses from the wiper switch to the vacuum motor for leaks. Tired old rubber gets awfully hard and brittle.
Beyond that, it's hard to imagine a problem with the switch, though not impossible. More likely, it's something in the vaccum motor that will require careful disassembly, cleaning, and inspection to discover. I like to do that kind of stuff myself. However, unless your handy (and patient) and can find a rebuild kit (or even gaskets), such work might be best left to a qualified rebuilder, as some internal parts are hard to come by.
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