Dear fellow pickup enthousiasts,
This is my first post on this forum so i hope everything works.
Me and my father have an 1951 Chevrolet 3100 at home in the Netherlands. Because i live in the Netherlands I frequently have to deal with rain

The original windschield wiper motor didn't work so yesterday I tried cleaning up the motor so it would work again. I installed everything back and the windschield wipers worked beter than before. The only problem is that the wipers only go up and then just stop. When i turn the the knob back the windschield wipers return back down. From what i saw on videos the windschield wipers should go automatically back and forth. Does somebody know what the problem could be?
Kind regards,
Thijs