Thanks for all the posts on this. I pulled out the delay module and found diode D2 with bad solder joints to the circuit board on the heatsink bracket side. Diode D2 feed the relay that completes the low speed circuit and when the solder joints break, no low speed and no delay. I resoldered all three connections to D2 on the circuit board and added some small wires wrapped around the protruding leads to the relay leads in parallel for extra connections (just in case the PCB joints break again). D2 is located right next to the relay and has a U-shaped bent metal heat sink bracket with two bend tangs soldered to the PCB. After soldering and adding the parallel wires, reinstalled and it works like new. But before I read these posts, I had changed the wiper motor and still had no low speed so was scratching my head thinking it was the switch. Now I have a new motor and 'better than new' delay control module so should be good for many years.