QUOTE(914Sixer @ Jan 2 2016, 07:55 PM)
Does wiper linkage move with motor disconnected? Most of the time the motor is good but the shafts are frozen in the tubes. All the linkage has to come apart to repair.
Quick test. First verify fuse is good. Flip the wiper arms back off the windshield. Now turn the wipers on, do they move? If so, do they move normal or very slowly? If they move chances are the shafts are caked up with rust/crud/gunk. You could try taking every thing off on the top side of the cowl and then use some Penetrating oil on the exposed shafts. Give them a soak twice a day for a few days. Once done put the top side back together, flip wipers off windshield and try them again. Do they wipe faster? Keep repeating these steps until wipers move freely.
If you have done all this, checked the fuse, verified there is power to the motor and it still doesn't work then could be the wiper switch itself. I have never seen a bad wiper motor before, 95% of the time the shafts are frozen OR the switch is bad.
If replacing the wiper assembly then you will need to pull the gas tank, disconnect the ventilation hoses, drop the fresh air box loose and the pull the wipe assembly. Don't forget the rubber bushing on the backside that is attached to the firewall under the dash.
Trying to pull the wiper motor with the assembly in place is a real PITA. Hope this helps.
Oh, once your issue is resolved, once a month flip the wipers back off the windshield and run them for a 5 - 10 "wipes". I had the same issue with my 70, after a few days of soaking with Penetrating oil I was able to get things working properly. I made sure once a month to 'exercise' the wipers to keep them free and moving. When I put it away for winter storage I always gave the wiper shafts a few drops of oil to keep things free moving.