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somewhere the ac wiring is touching the wiper wiring and giving it power? most likely two wires are touching without insulation somewhere....look at the wiring diagrams and loom locations and see where things get close....probably not until the firewall and could be on the engine bay side.
Thanks for the input… although that’s the first thing I tried.. even going so far as to running looms around both harnesses.. no such luck for an easy fix.
you may have to get a meter out and see if it is the hot or ground on the wipers getting energized when you move the switch. or you may be able to disconnect the wiper wiring at different locations and see if it stops the issue. that may help narrow it down.