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Wiring diagram for your 2008 8500 series furnace
First image shows furnace control board.. Four wires .. two will be BLUE and are the SIGNAL wires to the AC control board up on your roof.. Zone 1 AC.. these wires are PLUS and MINUS and same color
Other two wires are typically RED and YELLOW.. Red is 12 volts Dc source to run the control board, blower motor, etc..
Second image shows where the two BLUE Signal wires run from furnace up to roof AC control board and connect
The telephone cable runs from thermostat to roof AC control board to send signal to AC unit and furnace
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