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The ground is often the problem. And from the slight experience I have mainting non-Volvos, this seems to hold true for other cars also.
Since the wiper motor is mounted on rubber bushings it needs a ground; the bolt through the mount hole would not ground the case to the body otherwise. OEM ground is usually a brass/copper strap connecting the case to the mount bolt sleeve. Often this strap breaks or otherwise fails.
If you suspect a bad ground you can make a temporary tester one quickly; just screw it to the firewall where the braided ground is and hold it firmly against the bare metal motor casing. Don't let go and become the conductor yourself!
You can make your own permanent ground; just use a fairly heavy wire - at least as thick as the thickest one in the harness to the motor. I used a crimp on ring connector at each end. You'll find a bunch of long thin screws holding the assembly case together; use one of those.
I've had a couple motors where that was not the problem. I've been told you can open the motor up and usually bring it back to life by cleaning up the innards. But I've never done it.
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Sven: '89 245 NA, 951 ECU, expanded air dam to 7" from ground, forward belly pan reaches oem belly pan, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245 NA stock.
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