OK, some genius decided it would be nice to "fix" some ac wiring and now I'm left with the mess. There should be 4 wires coming to/from the magnetic clutch relay to match the 4 prongs. There are only 3 wires on mine. The wire I am missing is the black/blue wire that leads to a dual pressure switch. Can someone show me where this wire should go and where that switch is to see if it is cut off along that route? I have gone as far as i can go with my BGB without knowing where the wire should run.