1997 Ski-Doo Factory Shop Manual Volume One, Page 222Get this manual
Section 05 ELECTRICAL Sub-Section 07 (TESTING PROCEDURE)
VOLTAGE REGULATOR INSPECTION
A faulty voltage regulator is often responsible for frequent burned bulbsCAUTIONNever run an engine with faulty or inoperative voltage regulatorThis could damage the DUCATI CDI module
B) Voltmeter Test
' nating current (AC)For accurate reading, use RMS voltmeterConnect wire of the voltmeter to YELLOWBLACK wireConnect the other wire of the voltmeter to YELLOW wireLift the rear of vehicle and support with mechanical standStart the engine at an idle without opening the throttleWARNINGEnsure the track is free of particles which might be thrown out while track is rotatingKeep hands, tools, feet and clothing clear of trackEnsure no-one is standing in close proximity to the vehicleSlowly open the throttle and accelerate the engine to increase the RPMIf the meter reads over 15 volts, the regulator is defective and must be replacedCAUTIONDo not increase the RPM so the voltage exceeds 15 as the bulb(s) will burnNOTEWhatever the voltmeter type used (peak voltage or RMS) the voltage must not exceed 15 (a defective regulator will allow voltage to exceed 15 as engine RPM is increased)