I don't know if this helps but my info is that starting with the 72 240Z some/all, intermittent wipers were added which changed the wiring, connectors, and hardware/mounting of the combo switch. If you have a 70 240Z you need the early combo switch and wiring. Fig. 2 shows the 70 combo wiring.http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1d/1d/80/0900823d801d1d80.jsp
LARRY