Product review (4 stars): Worked great on my very old Frigidaire
Worked great on my very old Frigidaire.  In addition to needing a new start relay (to replace the old YT relay), it needed a charge.  The service technician, who is/was experienced with old machines, noted that "it should not work."  I forget the exact rational, but he did agree that as it was working there was no reason not to use it.  Perfect for the old fridge.