I Have 12v on the PK/RD wire withe key on and A/C on
1.0v on gray wire with key and A/C on

Large wires going into the FCM
BLK-4.7v
BLK -13.0v
OR-0
OR -0
when i started the car with A/c on I measured again
PK/RD- 4.5v
GRAY 4.5v as i was removing insulating wrap on gray wire the fan kicked on at low speed !!! yipppeee

So that tells me that you were CORRECT !Bad connection or wiring at harness .Right ?