Have you checked to see if your cabin filter is wet when this happens? I had water leaking through cowl and into the filter intake and thus down onto wiring harnesses on the passenger side. My seat heaters were on as a result. Replaced cowl and fab’d up a cover like others in this thread shows. No problems since.
Water in Passenger Footwell - https://forum.ih8mud.com/threads/water-in-passenger-footwell.1283532/page-3#post-14432979
Water in Passenger Footwell - https://forum.ih8mud.com/threads/water-in-passenger-footwell.1283532/page-3#post-14432979