I bought a Roberk P25 wiper delay control and can't get it to work right. Here are pics of my truck's schematics and the Roberk instruction sheet. Note the instructions only go back to '72, but the wiring and color codes match. It would seem that I have it wired correctly, but it doesn't work. If I turn the wipers on low nothing happens. If I then turn on the controller, it clicks at what seems to be the proper interval, but still nothing happens. If I turn the wipers to high, they run at high speed which is very noisy and annoying.