We just got this 96 GP running today (engine swap runs great) but it has some electrical issues. Relays check fine. The fans work if you do the relay paperclip trick. It has a new coolant temp switch. Also the air conditioner is not engaging the clutch, no current through the harness. The ECM isn't providing a necessary ground to the relays to kick the fans on.

I was careful on marking every harness connection, I'm really puzzled. What's wrong with this thing?