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Hello,
I also have a 1989 VOLVO 780 T.
We enjoy the car...and plan to take her out for fall foliage here in Vermont soon.
Have you inspected and measured the resistor pack on the driver's side inner fender? If not, I would extend to you to find it, disconnect the white connector and measure the impedance from each end of each resistor, off the cuff should measure 7 ohms...inspect the plug for corrosion and the tips of each resistor.
Contact me for photos since I/We cannot upload.
Best,
Paul (VTV745T)
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