Troubles with Turn Signals 67 Barracuda

There is a phenomenon in Mopar wiring, iirc, if the wipers?, heater?, brake-lite (pedal depressed)?, 4-way?, are all activated with the key off, the 4-way will intermittently power all the for-mentioned+ stuff, - again, iirc.
Moral, make sure 4-way is off .
Good luck .