No power to heater A/C swtch

[lowerunner]

'92 Ranger XLT 2.3l
My AC quit working the other day. When I push the AC button I get no light. Checked the fuses and none were blown. I replaced the switch and no help. I started troubleshooting the wires that go to the switch and found I have no power to the two Yellow wires at the switch. If I jumper these wires I get AC and the light is on. I would rather fix it properly but I don't know where these two wires get their power from. They bothe connect at the same terminal at the switch. Can anyone help? I have no schematic to work from and this may be a simple solution.
Thanks in advance,

 

[TheJackal]

To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds . The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds . Record all DTCs displayed.