1978 Ski-Doo Shop Manual, Page 272Get this manual
SECTION 05 SUB-SECTION 03, (ELECTRICAL TESTS)
4Carefully install cover on case being certain that no wires are pinched between cover and caseSecure cover
NOTE: Weak batteries will not impair tester operation or calibrationThe light will glow dim
The ignition tester may give false readings if the rivets on the back cover come in contact with metal
Indicator knob alignment