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ICQ>
Jebreh
I've got an '86 that has done this in the past.
First thing to check is the ground for the motor. The motor grounds by a kind of hidden strap where it mounts. The mounts are otherwise isolated with rubber feet. Remove the mounting bolts and clean up the ground (on the car and the motor) with steel wool or something and see if that helps.
Second thing is to lube the linkage under the dash. I used a spray white lithium grease and hit all the joints that I could.
Third thing is to lube the little transmission on the motor. You can remove the flat plate that is facing upward, with the motor still installed in the car. It is self explanatory. I used petroleum jelly on the plastic gearing.
Forth thing is disassembly of the motor itself to perhaps lube and inspect. It is a straight forward disassembly but tricky to get the brushes in place and the rotor slid back into the housing. First remove the electrical connector, then unattach the linkage, remove the mounting bolts, and bring it inside. With the motor on the work bench, you remove the obvious screws and slide the case off. The first problem that I found with mine was that one of the magnets had come unglued from the case. I cleaned it up and epoxied it back in place. The rotor had scraped the magnet quite a bit as it turned and the friction had greatly reduced my wiper speed. Second I found that a crimp, where the magnet wire is attached to the pickup on the rotor, was a high resistance joint. The resistance reading from the wire to the brush pickup area was high and the crimp was loose. When the motor stopped with a brush on the area with the loose joint, it wouldn't start again. I smashed it with pliers and that fixed that.
With this motor so expensive I tend to disassemble it to see if there are any "user serviceable parts inside" or any obvious faults. I guess that is part of being a mechanical engineer.
Good Luck
Tim Glahn
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