1985 Ski-Doo snowmobile Service Manual, Page 373Get this manual
Section 04 ELECTRICAL Sub-section 06 (TESTING PROCEDURE)
Generator coil test (HI and LO)
This test is performed on the vehicle at cranking speed The two generator coils are called high and low speed generator coilsThe checker indicated the output of these coils by switching HI and LO positions as follows HI: Output of high speed generator coilLO: Output of high and low speed generator coilAnalysis of this test is diagnosed by its level
BEFORE TESTING
To prevent engine from starting and erroneous indication on the LED level indicator, remove the spark plug(s)CAUTION: To prevent dust or foreign matter from being introduced inside the cylinder(s) when cranking the engine install clean rag over the cylinder headConnect the power cord to the power source (115 volts AC60Hz) CAUTION: To prevent any damage to the checker, do not try other power source than the above mentioned one and ensure that the checker is installed on plane surface, away from vehicle vibrations
Control unit test
The COl checker inputs alternative current into the control unit instead of the generator coilThe output of the control unit will be indicated on the LED level indicator Analysis of this test is diagnosed by its level