Wipers don't stop why
the wiper motors have a sustain function inside
this magic switch, keeps wiper going it driver kill it with the switch.
preventing mid windows, stops. (safety and vision issues)
so that switch can break, and do what you said.
ive actually rebuilt them. and fixed the switch, many look mangled .
its inside the motor cover , below the wires connected there.
fix it, or replace it.
or the start up wire is hot all time.
the start up wire is the switch wire.
you turn off the wiper switch and its output goes to 0v, that be good
if stuck at 12v, its bad.
one way to check that is pull the switch connector (combo)
does wiper stop, yes, bad wiper switch
no,then bad wiper motor guts.
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