2004-2005 660 Yamaha Rhino Factory Service Manual, Page 389Get this manual
SIGNALING SYSTEM 3If the parking brake indicator light fails to come on: 1Bulb and bulb socket Check the bulb and bulb socket for continuityCONTINUITY 2Parking brake switch Refer to "CHECKING THE SWITCH"CONTINUITY NO CONTINUITY
Replace the bulb andor bulb socketNO CONTINUITY
Replace the parking brake switch