Yes .. I tried to find that schematic, but I just can't find one for that year/model..
Last time I used one from a gasser and it turned out to be different.
So , basically what I am saying is that if you are getting an interuption, it has to be on the feed side or the ground side ,, so, I would not assume which, as an imcomplete circuit can come from either .

If you bring 12v to the IC relay direct from bat and still have the problem , you then know it is not a feed problem... just like if you have a seperate ground wire to complete the IC circuit and the problem still exist, you know it is not a ground problem .. this is just a way of narrowing down your fault.
[ I am talking coil circuit of relay on this, not load]
If I were to just look at the symptoms , I would guess, with that time frame, that the aux fan was not coming On and the high side pressure was getting to high pressure sw cut-out.

but no schematic , so i do not know that...
Do you have the schemmatic???