1974 Ski-Doo Shop Manual, Page 199Get this manual
TEST NO.4 IGNITION COIL RESISTANCE (PRIMARY) 1Turn selector switch to position No.2(DISTRIB UTOR RESISTANCEfor checking low ohm values 2Connect the black test lead to no15 terminal of the ignition coil3Connect the red test lead to no1 terminal of the ignition coil4Read the RED figures on scale no2 Meter reading must be between specification limits If not, replace the defective coilPRIMARY RESISTANCE: 1.9 ohms 10