1978 Ski-Doo Shop Manual, Page 276Get this manual

1978 Ski-Doo Shop Manual, Page 276

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SECTION 05 SUB-SECTION 03, (ELECTRICAL TESTS)
black wires

3 Set tester switch and dial as follows: Engine type 248,294 305, 343, 346, 402, 440, 444, 640

Switch position