We have an L4240HSTC with 3rd function hydraulics on the loader. The switches on the loader joystick aren't getting power. The circuits check out; continuity on buttons and valve solenoids. The 3rd function wiring harness connects to a green connector with black and white wires behind the seat on the R.H. side below the seat belt buckle. I'm not getting current at this connector. Where and how should I trace this cable too? Is there a fuse involved? I have the service manual for this tractor, but the wiring diagrams aren't much help.