Quote Originally Posted by edwardb View Post
Assuming you want the Ford Performance control pack to control the cooling fan...
Good, I was interpreting it the same way. thanks. Its encouraging that I'm starting to understand the wiring enough to ask better questions.
I am starting to feel like this 4 post master switch is becoming a bit like a gimmick if I don't have the alternator power on it. Otherwise the ECU, the PCB, the fan, the alternator are always ready to fire off. The only thing the switch would be blocking is the starter and any down stream RF stuff.

Which generates the next question...
Would the fuel pump also shut off if the master is tripped OFF? Assuming the Ford control pack harness splices in to the rear RF harness, the RF harness is on the switch side ( on/off) so it runs w/ switched power... Is the ford fuel splice in wire carrying its own power at that point being on the always on side of power?