After driving 1000+ miles in 2 days in constant rain, the windshield wiper delay does not work. Even though the ww switch is in the delay position, the wipers continue to run as if the switch was in the low speed position.

If I turn the ww off and immediately on, there will be a 5 second delay as there should be, but once they start wiping they keep going with no delay between wipes. High and low speed work OK, delay is the only problem. Pushing the turn signal stalk in to the spray position causes the wipers to work for 2 or 3 times which is what it is supposed to do.

Where is the device located that causes the delay? Maybe I can just replace that from a parts car.

Car is a '80 300SD with 250,000+ miles. I originally put this post in the Diesel section but I had no useable answers. Please reply if you can help.

P E H