Hello 66er,
Thank you for your response.
I could find 2 posts which refer to a shutter relay. I tried to find it but was unsuccessful.
I also could not find a US equivalent of this.
https://www.schalk.de/motorsteuerungen/articles/dms-u5.html
I've think this would serve the same purpose.
https://www.amazon.com/gp/product/B08…981DVHUB9&psc=1
Is the pic 3 looks to be a correct wiring diagram?
Thanks.