I am trying to find an ORIGINAL replacement 10 hr defrost timer for this model. So far, I've only been able to get an 8 hour one with a black wire pigtail coming out, which makes the installation iffy. I did install an aftermarket 8 hr timer, but my refrigerator/freezer is not operating properly (defrosts too often). The original part # is 2176648. It does not have any external wires other than the four copper clips coming out of the base.

I'm replacing the defrost timer - in the part instructions, it shows 3 possible situations and gives 3 possible schematics for the defrost heater circuit in order to know which pin to put the pigtail for the timer motor on. Unfortunately, I don't have the schematic for this refrigerator and I haven't had much luck finding one online. Can anyone tell me which pin it should be - or point me to a site where I can find the schematic?