1978 Ski-Doo Shop Manual, Page 290Get this manual
SECTION 05 SUB-SECTION 03, (MERC-O-TRONIC TEST) (
TEST NO.3 IGNITION COIL RESISTANCE (SECONDARY)
1Turn selector switch to position no3 CONTINUITYCOIL
2Connect the black test lead to terminal no15 of the external coil
3Connect the red test lead to the spark plug terminal of the coil4Read the RED figures of Scale no3Meter reading must be between specification limitsThe values on red scale no3 are inOHM and must be multiplied by 1,000If coil is not within specifications, replace the defective coil