top of page

SM Wiring on USA Models


As noted in other sections of this article, the wiring was different on North American models. A set of schematics have been found that show USA model wiring. These schematics should be applicable to 1973 Canadian SM's as well. However 1971 and 1972 SM's in Canada are a bit of a hybrid between USA and Euro wiring.

Note that these schematics do not include wiring associated with the seat belt and open door warning systems. We believe that most of the hardware and wiring associated with the seat belts were added once the cars were in North America.

The schematics below are for manual shift cars only, although the vast majority of the wiring would be the same on cars with the automatic transmission. 

We have created a 'key' for these wiring harnesses. If readers spot any errors in our key, please let us know and we will correct it.

Key for Schematics (click to open)

Screen Shot 2022-02-27 at 9.56.04 AM.png

USA Harness Schematic (click to enlarge)

SM USA harness schematic.jpeg

USA Functional Schematic (click to enlarge)

SM USA schematic functional.jpeg



Since some of the North American wiring is not shown on the schematics (such as the seat belt buzzer and the door buzzer systems), we have attempted to help identify some of the unique components behind the dash....

Behind the Dash on North American SM's

(click to enlarge)

Screen Shot 2021-02-28 at 2_51_44 PM.jpg
bottom of page