Wiper acting stupid
There is a cycling circuit breaker at the switch. If that is the source of the clicking, it will totally fail eventually. Sounds like you have high resistance somewhere in the mechanical. So first,,, Go under the dash and disconnect the linkage at pitman arm. Does the gear motor run fine? If so the fault must be crusty wiper pivots. How difficult is it to move the wipers by hand? Majority of the work load and subsequent wear is in the drivers side pivot. I've been through this with 2 of 67 notch backs.