Never had that prob!
I doubt they share a curcuit however, as the wipers and fan have nothing to do with each other?
Perhaps the grommet in the firewall has popped out, and the loom has rubbed through on these 2 wires and shorting out?
Has anything been fiddled with? like has the dash or steering column been removed ever?
The wipers could just be a worn switch??
An auto electrician would be able to isolate the circuits and locate the problem pretty quickly I would imagine?
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