I have a friend who use to run a auto repair shop. Took me about 45 minutes, but I finally figured out what I have. Turns out the steering column, wiper motor, and related parts were from a 89 suburban, not the 85 half ton truck he told me they came from. I printed the wiring diagram and tried it on the bench. I could get low and high, but they would not shut off. I have had lots of experience with things that WONT work, but things that won’t STOP working is a new experience!! Turns out the terminals/contacts for the park switch were corroded. Without the contacts opening, as far as the motor is concerned the wiper arms haven’t reach the park position. A little polishing and sandpaper, bingo, they park and shut off properly.
My next issue, the wipers would not delay. I had low, high, and park, but no delay function. Crap, I figured I was going to have to shell out 160 for a delay wiper switch. Kinda chapped my ass, the guy swore the wipers worked properly. I guess that’s like the engine that “ran when it was pulled, or car drove fine before I parked it” storied. I decided to check the washer function. I connected a test light to power, and touched the test light probe to the pink wire. Suddenly the motor started running, then stopped a few seconds, then started again, etc. Apparently, unless the pulse board sees the resistance of the motor ( or on this case, the test light) in series with the power from the white wire, the delay function won’t work. Anyone in readerland without a washer motor, trying to get the delay to work? Everything works perfectly on the bench. Time to assemble the column for the last time and get some paint on it. It will be nice having it all one color!!
