2003 Polaris Deep Snow Snowmobiles Service Manual, Page 126Get this manual
ENGINES Engine Troubleshooting
PROBLEM Lights don't work PROBABLE CAUSE -Engine must be running -Check wiring harness connector -Check for burned out bulbs -Check wiring for shorts or loose connections -Disconnect taillight if headlight works, short is in taillight wiring or taillight -Check belt (center distance) -Check clutch -Check chain -Check drive sprocket assembly -Track frozen or stuck