1999 Ski-Doo Factory Shop Manual Volume Two, Page 300Get this manual

Section 06 ELECTRICAL Subsection 06 (TESTING PROCEDURE)
INSPECTION OF AC CIRCUIT ISOLATION
All Electric Start Models If AC circuit is not isolated from frame, headlamp beam will weaken

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives