Abstract: A multi-purpose common conductor electrical system for use with a vehicle steering assembly or the like, comprising a steering assembly having a rotatable steering wheel and being adapted for directing a vehicle; first and second control circuits connected to said steering wheel and rotatable therewith; a common conductor connected to said first and said second control circuits and extending at least a portion of said steering assembly length; a common power supply connected to said common conductor for providing power to said first and said second control circuits; blocking means for preventing the unintended conducting of power to said first control circuit when power is conducted to said second control circuit; and, limiting means for intentionally conducting power to said first control circuit when power is conducted to said second control circuit for permitting simultaneous operation of said first and said second control circuits is disclosed.