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The wiring for power windows is complicated by the driver's side master control panel - which you don't have.
There may be a way for you do do it. Power for the windows comes through two fuses. Nbr 10 is energized all the time, #12 only when the key is in Position II. The #12 circuit energizes a cut-out relay, #10 powers the motors.
Thus the windows are disabled with the key not in Position II. The power for the window motors themselves flows through Fuse #10, then the cut-out relay contacts, and then to the switches.
The motor needs only two wires to work, but they must have their polarity reversable to have the window go up and down.
The three-wire connector should have wires white, red, and green. They all go to the rocker switch. There are only a red and black wire from the switch to the motor. If black is (+) and red is (-), the window opens. Reverse that, black is (-) and red is (+), the wondow closes.
Try this on the 3-wire connector: Connect the white and green wires to ground, and the red to (+). See what the switch does. If it works, run the power to the red wire through Fuse #12. If fuse #12 blows, (stock wiring has a 16A funse in #10) you will want to put in that cut-out relay. Post back if that's necessary.
The book I am checking with is the Volvo Service Manual Wiring Diagrams 240 1987-88. It applies to the 1986 model for this circuitry. You can get the book for your 1986 from 1-800-25-VOLVO.
Good Luck,
Bob
:>)
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