1974 Ski-Doo Shop Manual, Page 193Get this manual
TEST NO.3 IGNITION COIL RESISTANCE (SECONDARY) 1Turn selector switch to position NO.3COIL CONTINUITY2Connect the black test lead to terminal no15 of the external coil3Connect the red test lead to the spark plug terminal of the coil4Read the RED figures of Scale NO.3Meter reading must be between specification limits The values on red scale no3 are in OHM and must be multiplied by 1,000If coil is not within specifications, replace the defective coilSECONDARY RESISTANCE