Disconnect the battery and clean the 4 posts in the center of the fuse box with a dremel. Undo the nuts, clean them, and clean the threaded posts and the 4 red wire connectors with a dremel. You will see brighter lights and faster wipers(still slow compared to todays standards)
If you have never disassembled the wiper arm pivots and the motor and re-lubed everything, there is a real good possibility that old grease is your problem. I rebuilt mine, making one good one out of two and it will run the wipers on a dry window at full speed
There is also the possibility that after all these years the wiper motors need to be 'overhauled'. This would mean having the stator and such turned and cleaned, new brushes, new wiring/terminals, etc. All of these parts can get corroded, worn, or dirty and cause a reduction in performance. A good electric motor shop can do much of the work, usually for a decent price.
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