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1st off I usually don't drive my 78 in the rain but on the way home from a show I used the wipers and when I thought the rain was over I shut them off and they parked but the right one did a little up/down movement until I completely stopped and they both stayed parked???
Tried it again just to check and bingo same thing happened!!!
Any clues out there my panel of C3 gurus??
JJ78
Most likely something worn in the linkage between the 2 arms. That is where I would check . Maybe with them parked give 3ach one a wiggle and see what you find.
If you purchase a new park switch and you have the Standard Wiper Motor Without the pulse option the correct 2 speed switch part number is GM 4960755
You can find them on e-bay selling for between $20.00 - $25.00.
Don't settle for a premium price from a Corvette Vendor...
You can watch the Park Switch function if you want to skip ahead in a video I made to the 1:55 mark.
Did a static check on the wiper operation with key on acc..
All speeds worked and when I turned it off no up/down when they parked??
One thing I noticed is the the switch/stalk plunger with the knurled **** and white arrow on it did nothing when actuated in every position???
When moved down as for as the stalk would go it did do a one time sweep and parked!!!
JJ78