I have to replace the Defrost Timer in my refrigerator.

I watched the installation video for the timer and it discusses having to put the black wire on a certain terminal on the new timer. I don't have any wiring diagrams from my 25 year old refrigerator.

Any chance someone might know which number terminal on the new timer I should connect its black wire too for my model refrigerator? The refrigerator was manufactured in 1992. Thanks for your time and help.