1984 Ski-Doo Shop Manual, Page 319Get this manual
SECTION 04 ElECTR ICAl SUB-SECTION 06 (TESTING PROCEDURE)
CONTROL UNIT DIODE TEST (4-5P only)
AFTER THE START SWITCH HAS BEEN DEPRESSED
READING DOES NOT CHANGE
READING IS AT THE CORRECT VALUE
READING CHANGES, BUT IT IS LOWER THAN THE CORRECT VALUE