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SM Wiring on USA Models


As noted in other sections of this article, the wiring was different on North American models. Some of the differences include side marker lights, headlights, the door buzzer system, the seat belt warning system, hazard lights, electric antenna wiring, and leak finder wiring.


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 warning systems. We believe that some of the hardware and maybe a bit of the 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)

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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, we have attempted to help identify some of the unique components behind the dash....

We have not found a schematic for the seat belt warning system for the SM. We did however find one for the DS and we think it is the same. The DS schematic is HERE

Behind the Dash on North American SM's

(click to enlarge)

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