2004-2005 660 Yamaha Rhino Factory Service Manual, Page 408Get this manual
CARBURETOR HEATING SYSTEM TROUBLESHOOTING IF THE CARBURETOR HEATING SYSTEM FAILS TO OPERATE: Procedure Check: 1Fuses (main, carburetor heater) 2Battery 3Main switch 4Thermo switch NOTE: Remove the following part(s) before troubleshooting1) Console Use the following special tool(s) for troubleshooting1Fuses (main, carburetor heater) Refer to "CHECKING THE SWITCH"CORRECT 2Battery Check the battery conditionRefer to "CHECKING AND CHARGING THE BATTERY" in chapter 3Open-circuit voltage 12.8 or more at 20 (68 F) CORRECT 3Main switch Refer to "CHECKING THE SWITCH"CORRECT Replace the main switchReplace the fuse(s)