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"...I beat one from the MA Pike too about 5 years ago..."
Probably the same cop. Was he a golfing partner of the Clerk?
I was very disappointed when I learned they were buddies, but then it turned out the judge had no tolerance for cops who don't know the law -- and thus break it.
Anyway.
The corrosion indicates that the relay got wet some time in the past. My experience with wet wiper relays is that the wipers run continuously.
The relay is very easy to swap. If you can find a friend with a 240, ask to borrow his relay -- conversely, try your relay in his (or her) 240. The intermittent function is controlled strictly by the relay and the switch. The motor is not involved, other than to run once it receives power. If you're convinced the relay's not failing, try the switch.
To answer your question, I resolder the heavy connections (to the relay and the lugs) using a solder gun -- 150-200 Watts -- and a small iron to resolder the rest. Rather than solder only "the obvious" I do 'em all. That way I know they're all done, and it only takes an extra few minutes.
Your original post casts doubt on the switch. It switches power to the motro, so may affect parking, and it separately switches power to the intermittent relay.
Want me to dig through my junk box for a switch and relay?
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