I have a 93 1500 and the wipers only worked in the wash position. The pulsed either two, three, or four times but it did not trigger the washer motor, although the washer motor is the least of my concerns right now I’m mentioning it because it might not actually be triggering the washer setting, first I assumed it was the pulse board. Being that mine came with the old style motor, I pulled one off of a truck with a newer style motor. Same problem. Replaced the pulse board in that one with no change. Replaced the switch in the column, also with no change. The weirdest part is that in every setting except the washer position they don’t do anything, but when it’s in the high position it acts like it tries to move the wipers but then stops and smokes from the switch. So I checked for a short. The purple wire that’s supposed to run the high speed setting is showing a ground, then I used a jumper wire with it unplugged from the switch just to bump the high speed wire and it arced, just like a short to ground, if I run the same jumper to the gray low speed wire it runs in low. Also when the wiper motor itself is unplugged, it no longer is shorted and the switch doesn’t smoke. That’s what got me to try a new motor but it was the same with every motor, used or new. With the same problem happening even with a new motor, pulse board, and switch, and the wires acting like they’re shorted unless they’re unplugged, I’m at a complete loss. I would happily re-wire the circuit but every wiring diagram I’ve seen shows the purple wire being energized for high speed, but when I energize mine it’s a dead short. Does anyone have any suggestions on where to go from here?