1989 Ski-Doo Repair Manual, Page 410Get this manual
Section 04 ELECTRICAL Sub-section 06 (TESTING PROCEDURE)
IGNITION MODULE DIODE TEST (4-5P ONLY)
AFTER THE START SWITCH HAS BEEN DEPRESSED
READING DOES NOT CHANGE
READ ING IS AT THE CORRECT VALUE
READING CHANGES, BUT IT IS LOWER THAN THE CORRECT VALUE